Question

In a human body cells like blood cell and skin cell help deviding to replace the dead cells why should then doctor are worried about the head injury

Answer 1

because the cells present in the head do not divide and thus cannot be replaced

Answer 2

In the human body head is the main function unit. When a head injury occurs doctors are worried that the functional system of the brain doesn't get damage. Even if the cells get replaced the wound will affect the functions of the brain...

Hope this helps you...