Question

Why do muscles change their shape in response to a nerve impulse?

Answer 1

Answer:

Muscles change their shape in order to generate waves of depolarization which then reach the central nervous system and come back as motor nerves

Answer 2

Answer:

Muscle cells have special proteins that change both their shape and their arrangement in the cell in response to nervous electrical impulses. When this happens, new arrangements of these proteins give the muscle cells a shorter form. Thus, the muscle contracts.