Functions of vertebral column :
1. It protects the spinal cord.
2. It supports head.
3. It provides erect posture, balance and stability for the body.
4. It provides attachment points for the ribs, pelvic bones, and many muscles.
5. Allows for flexibility and mobility.
6.Supports the structure and weight of the body in various activities.
Answer the following briefly :
(a) How does a muscle shorten during its contraction and lengthen during its relaxation?
(b) What biological functions are served by the skeletal system ?
(c) Why a red muscle fibre can work for a prolonged period while a white musule fibre suffers from fatigue after a shorter work ?
