Why do I have hair?
Hair originally helped prevent heat loss from the body. It no longer has that function although it does help to protect your head. Each hair grows from a pit in the skin called a follicle. The hair itself is made of a tough material called keratin, and it grows continuously from the follicle. The hair shaft contains pigment that gives the hair its colour. In older people, air may enter the hollow hair shaft, making it look grey.
Why is some hair curly?
Hair is straight or curly depending on the shape of the follicle from which it grows. Straight hair grows from completely round follicles, while wavy hair comes from oval follicles. Very curly hair grows from flattened follicles.
Why do some people go bald?
A substance called testosterone affects hair growth in men. It is responsible for the tough facial beard grown by men. Changes in testosterone levels affect the amount of hair growing on a man’s head.
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