Hair shaft
The hair shaft is the part of the hair that you see on the surface of skin .
That part is called as hair root. There is very tiny muscle, attached to it.
Hair root
The two main divisions of the hair are the hair shaft and the hair follicle. The hair shaft is the visible part of the hair that extends from the scalp or skin surface, while the hair follicle is the structure within the skin that produces the hair.
The part of the hair below the skin's surface is called the follicle. The hair follicle is essentially the root of the hair where it begins to grow just beneath the surface of the skin.
Mountain goat are suited to their environment as they have thick skin and hair on their body surface that protects them from cold.
The hypothalamus controls body temperature Hair contribute to the effects of preserving body temperature. Feet have no contribution in body temperature, other than expanding the surface area of your body, requiring excess energy requirements in re-warming the blood that returns from the extremities; just like hands
root hairs
The skin helps to regulate body temperature through the process of vasodilation and vasoconstriction. When the body is too hot, blood vessels near the surface of the skin dilate, allowing more blood to flow to the surface and release heat through sweating. When the body is too cold, blood vessels constrict to reduce blood flow to the surface, conserving heat in the body's core.
No, hair does not grow on the tongue. The surface of the tongue is covered in papillae, taste buds, and lingual tonsils, but it does not have hair follicles like the skin on the rest of the body.
No. Considering that hair grows from the follicle and not at the tip then, in a manner of speaking, hair is always growing under your hair, however, it doesn't form a "second layer" of hair but merely extends the current one.
Back hair is the fastest growing hair on your body.