Muscles are controlled by the autonomic nervous system and operate the internal organs, blood vessels, and glandular ducts.

Smooth muscles

Explanation:

Smooth muscles are controlled by the autonomic nervous system that is responsible for involuntary movements that you do not have to think about. Smooth muscles are found in walls of hollow organs such as as your gastrointernal tract and blood vessels. They are responsible for peristalsis during digestion, internal muscle contractions when urinating and for pushing a baby during child-birth.

a. by using fur or clothes to trap heat energy near the body

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