Question

what does contraction amd relaxation mean?

Answer 1

Contraction means making muscles fibre short or long.Like of uterus in time of birth.
Relaxation means freedom from muscle tension and nervousness and anxiety.Like in brain and central nervous them muscle relaxation is there.A and they both occur many times in a day like when you work this process is normal.

Hope it helped you..................

Answer 2

Answer:

During contraction, the muscles fibres shorten, the muscle pulls on the ligaments that connect the bones and the movable body parts. During relaxation the muscle fibres come to their original position. This movement of muscles cells or the muscle fibres results in the movement of the body parts.