Question

How do muscles cause action or movement?

Answer 1

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When a motor nerve impulse sent by the spinal cord (or brain) reaches the effector organs (which are muscles), then the muscles cause action or movement (such as lifting the hand away from a hot plate). We will now describe how muscles are able to move in response to electrical nerve impulses and cause action.

Muscles are made up of muscle cells. Muscle cells contain special proteins which can change their arrangement when stimulated by electrical impulses, causing the muscle cells to change shape and contract. When the muscle cells contract, the muscles also contract (and become shorter).

When the muscles contract, they pull on the bones of the body part and make it move.

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Answer 2

Muscles actually takes action on the basis of the redone of stimuli generated by the different sense organ.

The simplest notion of movement at the cellular level is that muscle cells will move by $\textbf{changing their shape}$ so that they shorten.