Why does your hair grow?

Question

is hair poisonous? is that the reason why it escapes the body?

what about your nails?

Answer 1

It leaves cause it dies

Answer 2

this is quite hard to explain because this is invovle on anatomical studies but i know for sure that hair and nails are not poisonous and so as nails.

i would recommend you to read anatomy and physiology book in the library  

Answer 3

Hair is not poisonous. It is simply a part of your body that cycles forming new growth continuously much like your skin, nails etc.

Hair, as with nails, feathers, scales, sweatglands, etc is a mineature organ derived from an interaction of tissues during embryonic development.Unlike many organs, once formed, hair undergoes a continual cycling of phases including a growth phase (called anagen) a regression phase (catagen), a resting phase (telogen) and a shedding of the old hair shaft (exogen) which is then replaced by a new one as the hair follicle resumes a new anagen phase.

A rather lengthy but complete if somewhat technical explanation can be found in the scientific article below