People in Argentina have less schooling than people in Mexico. Therefore, the correct option is option A.
The Human Development study Office of the UN Development Programme (UNDP) publishes the report on human development (HDR), which is a yearly Human Development Index study. The initial version of HDR was introduced in 1990 by Indian Nobel Prize winner Amartya Sen and Pakistani businessman Mahbub ul Haq. Since then, reports have been produced annually and have used the method of human development to study various issues. People in Argentina have less schooling than people in Mexico.
Therefore, the correct option is option A.
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According to the cephalocaudal principle,A. upper body parts develop before lower parts.B. lower body parts develop before upper parts.C. upper and lower body parts develop simultaneously.D. the order of development depends on environmental influences.
Answer: According to the cephalocaudal principle, upper body parts develop before lower parts. Therefore, option A is the correct answer.
Explanation:
According to the cephalocaudal principle, which means that upper body parts develop before lower parts.
The correct option is :- (A)
The cephalocaudal principle is a developmental principle that describes the pattern of growth and development from head to tail or from top to bottom.
According to this principle, during prenatal and early postnatal development, the upper body parts (such as the head, neck, and shoulders) develop before the lower body parts (such as the trunk, pelvis, and legs).
This means that development proceeds in a sequential manner, with the head and upper body developing earlier than the lower body. This principle is observed in various aspects of human development, including physical growth, motor development, and neurological development.
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The dense, active protoplasm found in the center of the cell is the:
A) nucleus
B) membrane
C) mitosis
D) cytoplasm
The dense, active protoplasm found in the center of the cell is the nucleus. It plays a crucial role in controlling cell activities and contains the cell's genetic material. So the answer is A) nucleus.
The dense, active protoplasm found in the center of the cell is the nucleus. It is often referred to as the "brain" of the cell because it contains the cell's genetic material in the form of DNA. The nucleus is surrounded by a double-layered nuclear membrane that protects the DNA from damage and regulates the movement of substances in and out of the nucleus. The DNA in the nucleus contains the genetic information that determines the structure, function, and behavior of the cell. The nucleus is critical for cell growth, development, and reproduction, and plays a crucial role in the overall function of the cell.
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What is conventrional ultrafiltration (CUF)?
The Conventional ultrafiltration (CUF) is a type of membrane filtration process that separates suspended solids, colloids, and large molecules from a liquid stream using a semi-permeable membrane. Its conventional nature makes it a popular and reliable choice in industrial various and municipal applications.
The CUF is commonly used in various industrial and municipal applications, such as water treatment and wastewater treatment. The process of CUF is considered conventional because it is a widely used and established method of membrane filtration. Other types of membrane filtration processes, such as nanofiltration and reverse osmosis, have emerged as more advanced alternatives to CUF. However, CUF remains popular due to its simplicity, reliability, and relatively low cost compared to more advanced technologies. In summary, CUF is a well-established and widely used type of membrane filtration process that separates suspended solids, colloids, and large molecules from a liquid stream using a semi-permeable membrane. Its conventional nature makes it a popular and reliable choice in various industrial and municipal applications.
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Which of these proteins bind to the rolling leukocyte, causing it to adhere tightly to the endothelium?A. integrinsB. PAF receptorsC. ICAMsD. P-selectionsE. selectins
The proteins that bind to the rolling leukocyte, causing it to adhere tightly to the endothelium are: A. integrins and C. ICAMs.
ICAMs, or intercellular adhesion molecules, are a group of proteins that are also involved in cell adhesion. They are expressed on the surface of endothelial cells and interact with integrins on the surface of leukocytes.
This interaction strengthens the adhesion of the leukocyte to the endothelium, allowing it to firmly adhere and subsequently migrate into the surrounding tissues.
Together, integrins and ICAMs play a critical role in the process of leukocyte extravasation, enabling leukocytes to adhere to the endothelium and migrate into tissues to mount an immune response.
Dysregulation of this process can lead to a variety of inflammatory diseases, including autoimmune disorders and chronic inflammation.
In conclusion, the proteins that bind to rolling leukocytes and cause them to adhere tightly to the endothelium are integrins and ICAMs. These proteins play a crucial role in the process of leukocyte extravasation and are important in the immune response and inflammation.
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Compare and contrast the way carbon is used in respiration and photosynthesis.
Answer:
Photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration transports it back into it. Photosynthesis converts oxygen into hydrogen in the atmosphere, and cellular respiration converts that hydrogen to energy, which is used to produce food. Photosynthesis transforms water and carbon dioxide into oxygen.
How many grams of carbohydrates are in a low fat milk exchange?
A low fat milk exchange typically contains around 12 grams of carbohydrates.
A low fat milk exchange typically contains about 12 grams of carbohydrates per serving. This is because milk naturally contains a type of sugar called lactose, which contributes to the carbohydrate content. However, the exact amount may vary slightly depending on the brand and type of milk. Choosing low fat milk can be a good option for those looking to limit their fat intake, while still getting the essential nutrients found in milk, such as calcium, vitamin D, and protein. It's important to keep in mind that individuals with lactose intolerance may need to choose lactose-free milk options.
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In a sarcomere, cross-bridge attachment occurs specifically in the
a. zone of overlap
b. H band
c. A band
d. M line
e. I band
In a sarcomere, cross-bridge attachment occurs specifically in the zone of overlap. The zone of overlap is the area where thick and thin filaments overlap in the sarcomere.
The thick filaments contain myosin protein, which forms cross-bridges with actin protein in the thin filaments during muscle contraction. The cross-bridge attachment occurs when the myosin heads bind to the actin filaments, forming a temporary attachment that allows the myosin to pull the actin toward the center of the sarcomere, shortening the muscle fiber.
The zone of overlap is also where the A band is located, which is the area where the thick filaments are present. The H band, on the other hand, is the area within the A band where only thick filaments are present, and the M line is the center of the sarcomere where the thick filaments are anchored. The I band is the area where only thin filaments are present and do not play a role in cross-bridge attachment.
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what do cone cells do
Answer:
Cone cells, or cones, are photoreceptor cells in the retina of the eye which function best in relatively bright light. The cone cells gradually become more sparse towards the periphery of the retina. Cones are less sensitive to light than the rod cells in the retina (which support vision at low light levels), but allow the perception of color. They are also able to perceive finer detail and more rapid changes in images, because their response times to stimuli are faster than those of rods.
Explanation:
What are some patterns of direct transmission of infectious disease?
Patterns of direct transmission of infectious disease include person-to-person contact, droplet transmission, and vertical transmission from mother to child during pregnancy, childbirth, or breastfeeding.
Direct transmission of infectious diseases involves the transfer of pathogens directly from an infected person or animal to a susceptible host. This can occur through person-to-person contact, such as touching, kissing, or sexual contact, as well as through droplet transmission, which involves the release of large respiratory droplets containing pathogens through coughing or sneezing. Another form of direct transmission is vertical transmission, which occurs when a mother passes an infectious agent to her child during pregnancy, childbirth, or breastfeeding. These patterns of direct transmission can increase the risk of infectious disease spread, particularly in crowded environments or during close contact with infected individuals. Preventative measures such as proper hand hygiene and personal protective equipment can help reduce the risk of transmission.
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PLEASE HELP
Calculate the average
distance that the DNA fragments traveled. How
much farther than the average distance did the
smallest DNA fragment travel?
Where the information on the histogram is considered,
the average distances travelled = 1.733cmThe smallest DNA fragment travelled 0.933 cm less thatn the average distance.How is this so?Average distance travelled is: (A + B + C + D + E + F)/6
Given:
Distance for A = 2.75cm
Distance for B = 1.25cm
Distance for C = 0.8cm
Distance for D = 1.75cm
Distance for E = 2.25cm
Distance for F = 1.4cm
Average distance = ( 2.75 + 1.25 + 0 .8 + 1.75 + 2.25 + 1.4) /6
Average distance = 1.733 cm
Smallest fragment distance = Distance of C - Average distance
= 0.8 - 1.733
= -0.933
Thus, the smallest DNA Fragment travelled farther than the average distance by 0.933cm.
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The technology of DNA typing had its beginnings in 1985 with the work of
Answer:
Explanation:
The technology of DNA typing, also known as DNA fingerprinting, had its beginnings in 1985 with the work of Sir Alec Jeffreys, a geneticist at the University of Leicester in England. Jeffreys was studying variations in DNA sequences among individuals, and discovered that certain regions of the DNA, known as minisatellites, had variable numbers of repeated segments. Jeffreys realized that these variable regions could be used to create a unique "fingerprint" for each individual, as the probability of two individuals having the same DNA fingerprint was very low.
This breakthrough led to the development of techniques for DNA profiling and forensic analysis, which have since become important tools in criminal investigations and paternity testing, among other applications.
Active sites on the actin become available for binding after
a. calcium binds to troponin
b. calcium binds to tropomyosin
c. actin binds to troponin
d. myosin binds to troponin
e. troponin binds to tropomyosin
a. Calcium binds to troponin, which causes a conformational change in tropomyosin, exposing the active sites on the actin filament for binding with myosin.
When muscle contraction is initiated, calcium ions are released and bind to troponin. This binding causes a conformational change in troponin, which then moves tropomyosin away from the active sites on the actin. As a result, these active sites become available for myosin head binding, allowing muscle contraction to occur. Troponin binding to tropomyosin is also necessary, as it helps to keep the myosin binding sites on the actin filament covered until calcium binds to troponin and causes the conformational change.
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at a specific area of a chromosome, the sequence of nucleotides below is present where the chain opens to form a replication fork: 3' c c t a g g c t g c a a t c c 5' an rna primer is formed starting at the underlined t (t) of the template. which of the following represents the primer sequence? group of answer choices 5' g c c u a g g 3' 5'a c g t t a g g 3' 5' a c g u u a g g 3' 5' g c c t a g g 3'
The RNA primer is synthesized in the 5' to 3' direction and is complementary to the template strand. In the given sequence, the template strand reads 3' CCTAGGCTGCAATCC 5', with the underlined T representing the site of primer synthesis. RNA nucleotides will be added to the primer in the 5' to 3' direction, using the template as a guide. The complementary RNA sequence will be 5' ACUUAGG 3'. Therefore, the correct answer is "5' ACUUAGG 3'".
During DNA replication, an RNA primer is required to initiate DNA synthesis by DNA polymerase. The RNA primer is synthesized by primase, an enzyme that recognizes the single-stranded DNA template and synthesizes RNA nucleotides in the 5' to 3' direction.
In the given sequence, the template strand reads 3' CCTAGGCTGCAATCC 5'. The RNA primer is synthesized starting from the underlined T (T) of the template. RNA nucleotides will be added to the primer in the 5' to 3' direction, using the template as a guide. The complementary RNA sequence will be 5' ACUUAGG 3'.
Once the RNA primer is synthesized, DNA polymerase can begin elongating the primer by adding DNA nucleotides in the 5' to 3' direction. The leading strand is synthesized continuously, while the lagging strand is synthesized discontinuously in short fragments called Okazaki fragments, each of which requires its own RNA primer.
After DNA synthesis is complete, the RNA primers are removed and replaced with DNA nucleotides by DNA polymerase and other enzymes. The resulting gaps between Okazaki fragments are then sealed by DNA ligase, resulting in a complete and fully functional double-stranded DNA molecule.
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Compare and contrast chemical equations and algebraic equations
The chemical formulae of the reactants and products, the direction in which the reaction proceeds, and the relative quantities of the reactants and products are all displayed in a chemical equation.
Chemical equations are symbols and chemical formulae that depict a chemical response symbolically. With a else sign separating the realities in both the reactants and the products and an arrow pointing in the direction of the products to indicate the direction of the response, the reactant realities are given on the left and the product realities are given on the right.
Chemical formulae can be mixed, structural (represented by pictures), or both. The absolute values of the stoichiometric figures are shown as portions next to the symbols and formulae of the colorful realities. Jean Beguin drew the first chemical equation in 1615.
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Complete question:
Write a report that compares and contrasts chemical equations and mathematical equations.
which of the following amino acids can bind to dna both in sequence specific (specific dna bases) as well as sequence non-specific (to phosphate backbone) manner? (think carefully!!) glutamine lysine arginine asparagine
Out of the given options, only one amino acid, Arginine, is known to bind to DNA both in a sequence-specific and sequence-non-specific manner.
Arginine is a positively charged amino acid with a guanidinium group in its side chain, which allows it to form salt bridges and hydrogen bonds with the negatively charged phosphate groups of the DNA backbone.
This interaction enables Arginine to bind to DNA in a sequence-non-specific manner. Additionally, Arginine can also interact with specific DNA bases through hydrogen bonds and π-stacking interactions, allowing it to bind to DNA in a sequence-specific manner.
Glutamine and Asparagine, on the other hand, lack the positively charged groups required for non-specific binding to DNA, while Lysine has a positively charged amino group that can bind non-specifically to the DNA backbone, but it does not interact with specific DNA bases.
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Which type of tissue contracts and moves various parts of the body?
A) nerve tissue
B) epithelial tissue
C) muscles tissue
D) connective tissue
The correct answer is muscle tissue. Muscle tissue is a specialized type of tissue that contracts and produces movement in various parts of the body. There are three types of muscle tissue: skeletal, smooth, and cardiac.
Skeletal muscle tissue is attached to bones and allows for voluntary movements, such as walking or lifting weights. Smooth muscle tissue is found in the walls of internal organs and produces involuntary movements, such as peristalsis in the digestive system. Cardiac muscle tissue is found in the heart and produces the rhythmic contractions that pump blood throughout the body.
Nerve tissue is responsible for transmitting signals throughout the body, epithelial tissue covers and protects the body's surfaces and organs, and connective tissue provides support and structure to the body's organs and tissues.
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The __________ __________ is the length of time it takes for a population of microorganisms to double in number.
The term you are referring to is called the "generation time." It is a critical factor in microbiology and is used to calculate the growth rate of microorganisms. The generation time can vary greatly depending on the type of microorganism, environmental conditions, and the availability of nutrients.
For example, some bacteria have a generation time of as little as 20 minutes, while others may take several hours or even days to double in number. The generation time is a critical factor in the spread of infectious diseases as it determines how quickly a population of pathogens can grow and spread within a host.
Understanding the generation time is also important in industrial microbiology, where it is used to optimize the growth conditions of microorganisms used in food production, pharmaceuticals, and other applications. By controlling the generation time, scientists can maximize the yield of products and minimize the time and resources required to produce them.
In summary, the generation time is the time it takes for a population of microorganisms to double in number and is a critical factor in microbiology and industrial microbiology.
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CN XI- spinal acessory nerve
a. true
b. false
a. True The CN XI refers to the eleventh cranial nerve, which is the spinal accessory nerve. It is responsible for controlling certain head and shoulder movements.
Every cranial nerve is paired, but the vagus cranial nerve is really thousands of nerves.
The cranial nerves are a set of 12 paired nerves in the following brain. Cranial nerves transmit electrical signals middle from two points your brain, face, neck, and torso. Your cranial nerves help you taste, smell, find out and feel perceptions. They still help you create facial verbalizations, ignore your eyes and move your tongue.
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Question 7
Marks: 1
The recommended backfill over the absorption field is 8 to12 inches.
Choose one answer.
a. True
b. False
The recommended backfill over the absorption field is 8 to 12 inches. Your answer: a. True which is to ensure even distribution of wastewater and its treatment by soil through pipe network.
8 to 12 inches of backfill is advised over the absorption field. Although the particular criteria may change depending on local standards and regulations as well as the septic system's construction, this statement is typically accurate.
A vital part of a septic system is the absorption field, commonly referred to as the drain field or leach field. The wastewater from the septic tank can be distributed and treated by the soil through a network of buried perforated pipes or chambers.
Gravel or sand can be utilised as the backfill material to cover the absorption field because they are porous and well-draining. The backfill layer should be thick enough to cover and support the pipes or chambers adequately, while also allowing for optimum oxygenation and effluent drainage.
Generally speaking, most home septic systems require a backfill depth of 8 to 12 inches. However, depending on elements like soil type, climate, and system design, the precise requirements could change. To make sure that the backfill depth complies with the necessary standards for a safe and functional septic system, it is crucial to consult local ordinances and regulations as well as a licenced septic system professional.
Hence answer is true.
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a) in simplest terms, what is the chemical nature of molecules that can be analyzed by electrophoresis? b) if you have a mixture of dna molecules that are all the same molecular weight and all linear, can they be separated by electrophoresis? explain your answer.
Electrophoresis is a technique that is used to separate molecules based on their electrical charge and size. In this process, an electric field is applied to a gel or other medium that contains the molecules to be separated. The molecules will then move through the gel towards the positive or negative electrode, depending on their charge.
DNA is a molecule that can be analyzed by electrophoresis. DNA is negatively charged due to the presence of phosphate groups, so it will move towards the positive electrode in an electric field. The size of DNA fragments can also be determined by electrophoresis, as smaller fragments will move more quickly through the gel than larger fragments.
If you have a mixture of DNA molecules that are all the same molecular weight and all linear, they will not be able to be separated by electrophoresis alone. This is because they have the same charge and size, so they will all move through the gel at the same rate. However, other techniques such as size exclusion chromatography or HPLC can be used to separate molecules of the same size but with different chemical properties.
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The plasma membrane of a skeletal muscle fiber is called the
a. sarcoplasm
b. sarcolemma
c. sarcoplasmic reticulum
d. sarcomere
e. sarcosome
The plasma membrane of a skeletal muscle fiber is called the sarcolemma. This membrane separates the interior of the muscle fiber from the extracellular environment and is essential for muscle function.
The plasma membrane, or sarcolemma, is a vital component of skeletal muscle fibers. It forms the boundary between the intracellular environment of the muscle fiber and the extracellular environment and regulates the exchange of ions, nutrients, and other molecules between the two. The sarcolemma also contains specialized structures called transverse tubules that are responsible for transmitting action potentials deep into the interior of the muscle fiber, allowing for coordinated muscle contraction. Finally, the sarcolemma also plays an important role in muscle repair and adaptation. Following muscle damage, the sarcolemma becomes permeable to calcium ions, triggering a cascade of events that lead to muscle regeneration and growth.
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How many extrinsic eye muscles surround one eyeball?
There are six extrinsic eye muscles that surround one eyeball. These muscles play a crucial role in controlling the movement of the eye and maintaining proper eye alignment. They can be categorized into two groups: four rectus muscles and two oblique muscles.
One eyeball is surrounded by six extrinsic eye muscles. These muscles work together to control the movement and positioning of the eye. The muscles are responsible for movements such as looking up, down, left, right, and rotating the eye. The six muscles are called the superior rectus, inferior rectus, medial rectus, lateral rectus, superior oblique, and inferior oblique. The rectus muscles are named for their straight paths, while the oblique muscles are named for their angled paths. The extrinsic eye muscles are controlled by three cranial nerves, which are responsible for eye movement and coordination. The nerves are the oculomotor nerve, trochlear nerve, and abducens nerve. The extrinsic eye muscles are attached to the outside of the eye and are responsible for moving the eyeball in different directions. These muscles allow us to track moving objects and adjust our gaze to focus on different distances.
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based on their cellular morphology, the red cells on this slide would be referred to as
Based on their cellular morphology, the red cells on this slide would be referred to as erythrocytes. Erythrocytes are the most common type of red blood cells found in the human body.
They have a unique biconcave shape, which enables them to be flexible and move through small capillaries easily. This shape also increases their surface area, which allows for greater oxygen exchange. When looking at a slide under a microscope, erythrocytes will appear small, round, and red in color.
They lack a nucleus and most organelles, allowing for more space to carry hemoglobin, the protein responsible for carrying oxygen. The size of erythrocytes is typically around 7-8 micrometers in diameter. Overall, the cellular morphology of erythrocytes makes them well-suited for their primary function of carrying oxygen to the body's tissues. They are essential for maintaining the body's oxygen balance and overall health.
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Why would a recombinant DNA molecule be inserted into a host cell?
It can protect the recombinant DNA.
Plasmids cannot be isolated outside of a host cell.
Restriction enzymes can only be used inside of a cell.
It can be copied, transcribed, and translated into a desired protein.
A recombinant DNA molecule may be inserted into a host cell for a variety of reasons, such as to produce a desired protein or to study gene expression. Once inside the host cell, the recombinant DNA can be copied, transcribed, and translated into the desired protein.
Additionally, the host cell can protect the recombinant DNA and provide the necessary cellular machinery for gene expression. Plasmids, which are often used as vectors for recombinant DNA, cannot be isolated outside of a host cell, making host-cell insertion necessary for successful genetic engineering.
Finally, restriction enzymes, which are commonly used in genetic engineering, can only be used inside of a cell, further highlighting the importance of host cell insertion.
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Which is used more often by taxonomic scientists? Common name or scientific name? Why?
By using scientific names, scientists can effectively communicate about specific species and maintain consistency in their research and documentation.
Taxonomic scientists generally use scientific names more often than common names. The reason for this preference is that scientific names, which are based on the binomial nomenclature system, provide a universally recognized and standardized way to identify and classify organisms.
This system helps avoid confusion that can arise from common names, which may vary among languages and regions. By using scientific names, scientists can effectively communicate about specific species and maintain consistency in their research and documentation.
Therefore, to ensure accuracy and clarity in their work, taxonomic scientists prefer to use scientific names.
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Carl Woese and George Fox proposed the (phylum/domain/family), a taxon that contains multiple kingdoms.
The answer to is that Carl Woese and George Fox proposed the domain, a taxon that contains multiple kingdoms.
This taxonomic rank is above the kingdom level and encompasses three major groups of life: Bacteria, Archaea, and Eukarya.
This proposal is that Woese and Fox discovered that there are fundamental differences between the genetic makeup of Bacteria and Archaea. These differences are significant enough to warrant a new taxonomic rank above the kingdom level.
Later on, it was also found that Eukarya shares a common ancestor with Archaea, which further supported the proposal for a new taxon.
the domain is a taxonomic rank proposed by Carl Woese and George Fox that contains multiple kingdoms. This proposal was based on genetic differences between Bacteria, Archaea, and Eukarya, and it has since become an important way to classify and understand the diversity of life on Earth.
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Some gram-negative prokaryotes adhere to surfaces and exchange genetic information using relatively short hairlike structures called ________
Some gram-negative prokaryotes adhere to surfaces and exchange genetic information using relatively short hairlike structures called pili.
Gram-negative bacteria are found in virtually all environments on Earth that support life. The gram-negative bacteria include the model organism Escherichia coli, as well as many pathogenic bacteria, such as Pseudomonas aeruginosa, Chlamydia trachomatis, and Yersinia pestis. Gram-negative bacteria have a cell envelope containing two membranes, the outer membrane is characterized by the presence of lipopolysaccharide in the outer leaflet of the bilayer structure. The lipopolysaccharide is involved in several aspects of pathogenicity.
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The jaguar Panthera onca is the largest cat in North America. It is found in areas across the Southwest. It is a carnivore that has powerful jaws and sharp teeth and preys on fish, turtles, and many smaller mammals. What type of relationship exists between the jaguar and turtles?
The jaguar preys on turtles, indicating a predator-prey relationship.
the jaguar Panthera onca preys on fish, turtles, and many smaller mammals. This indicates a predator-prey relationship between the jaguar and turtles. Predation is a type of ecological relationship in which one organism, the predator, kills and feeds on another organism, the prey, for food. In this case, the jaguar is the predator, and the turtles are the prey. Predation is a critical ecological process that regulates populations of organisms in an ecosystem. It can also have cascading effects on other ecological relationships in the ecosystem, such as changes in the abundance and distribution of other species that rely on the same resources or occupy similar niches.
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perform the action of flexion of the thigh at the knee. palpate the posterior thigh as you do so, and list the muscles responsible for this movement.
The semimembranosus, adductor magnus, and gracilis are three muscles of the adductor group and are responsible for hip adduction and internal rotation of the thigh.
Flexion of the thigh at the knee is a common movement used in everyday life. To perform this motion, stand with your feet shoulder width apart and while keeping the knee joint stationary, bring the lower leg forward and up towards the hip.
As you perform this movement, you should palpate the posterior thigh muscles that are responsible for this action. These muscles include the biceps femoris, semitendinosus, semimembranosus, adductor magnus, and the gracilis.
The biceps femoris and semitendinosus are two muscle components of the hamstring group and are responsible for the knee flexion movement.
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When calcium ion binds to troponin,
a. actin heads will bind to myosin
b. myosin shortens
c. muscle relaxation occurs
d. tropomyosin rolls away from the active site
e. active sites on the myosin are exposed
When calcium ion binds to troponin: d. tropomyosin rolls away from the active site
This occurs because the calcium ions cause a conformational change in the troponin molecule, which in turn moves tropomyosin away from the active sites on the actin. This exposes the binding sites for myosin, allowing the muscle contraction process to proceed. This results in the tropomyosin molecule rolling away from the active site on the actin, which exposes the active sites on the myosin. This then allows the myosin heads to bind to the exposed active site on the actin, which causes the myosin to shorten. This shortening is what causes the muscle contraction and relaxation to occur.
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