Question

B. Explain how the contraction and relaxation of
muscles help in movement.​

Answer 1

Answer:

Muscles in the body are different fibers which contract and relax to create movement. Movements are caused by muscle contracture and relaxation. The other relaxes as one muscle contracts and this induces the displacement. The heart's movements are called unconscious bodies, because they don't function on the comman

Answer 2

Explanation:

When the stimulation of the motor neuron providing the impulse to the muscle fibers stops, the chemical reaction that causes the rearrangement of the muscle fibers' proteins is stopped. This reverses the chemical processes in the muscle fibers and the muscle relaxes.