Identify the term that describes what happens to blood vessels when an animal is exposed to higher environmental temperature: a. vasoconstriction b. vasodilation c. none of the above d. all of above

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.  

the correct answer is: " ventricles " .

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