Which type of synovial joint allows you to rotate your head?
O A. Gliding joint
O B. Pivot joint
O C.
Saddle joint
OD
Ball-and-socket joint
Pivot joint is a freely moving diarthrosis that enables only rotary movement around a single axis. Therefore, option (C) allows you to rotate your head.
What is a pivot joint?The first and second vertebrae of the spine are connected to one another by a pivot joint, which is located at the base of the skull. Consequently, this enables the head to rotate from side to side. A pivot joint is a type of joint that allows for movement of the bones in only one plane, such as rotation around a single axis.
A synovial joint known as the atlantoaxial joint can be categorized as both a biaxial and a pivot joint. This joint is located in the upper region of the neck, between the first and second cervical vertebrae, also known as the atlas and axis, respectively.
Therefore, option (B) is correct.
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Why do you think we don't have oil glands on the palms of our hands and soles of our feet?
In the palms of our hand sand soles, there is no sebaceous gland, therefore, it does not secrete oil and these glands are spread over throughout the body.
What are sebaceous glands?Except for the palms of the hands and soles of the feet, sebaceous glands are found throughout the skin. Sebum is an oily material made, the body is covered in glands the scalp and face have most of them.
The bulk of lipids on the skin's surface is provided by the sebaceous gland through the production of sebum, which keeps moisture in and prevents the skin from drying out.
Sebum primarily escapes onto the skin's surface via a wicking motion involving the hair shaft because sebaceous glands drain into the hair canal.
Therefore sebaceous glands secrete oil and are present in the entire body except for the palms and soles of our feet.
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Blood type A+ indicates
a. The lack of anti-B antibodies
b. The presence of RH (Rhesus factor) antigen on the red blood cells
c. Type A blood that is unusually red
d. A certain determination that the blood is type A