Respuesta :

Answer:

Skeletal muscles only pull in one direction. For this reason they always come in pairs. When one muscle in a pair contracts, to bend a joint for example, its counterpart then contracts and pulls in the opposite direction to straighten the joint out again.

Explanation:

So the answer is B!!

julieneedshelp
Skeletal muscles are controlled by the somatic nervous system ; whereas the autonomic nervous system controls the involuntary muscles. Involuntary muscles include muscles that line the internal organs and the blood vessels .

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