Question

Which of the below is most likely to result in relaxation of smooth muscle upon an...

Which of the below is most likely to result in relaxation of smooth muscle upon an arteriole?

a. release of norepinephrine from SNS neurons near the arteriole

b. a blood clot in an artery that blocks blood flow into the tissue

PLEASE EXPLAIN WHY. THANK YOU.

Science   Anatomy-And-Physiology   
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Answer #1

b)b. a blood clot in an artery that blocks blood flow into the tissue

Explanation: Epinephrine is the neurotransmitter of the SNS which causes contraction of the smooth muscles of the arterioles.

Blockage of the artery due to blood clot decreases the blood supply to tissue supplied by the given artery. As a result of low perfusion to the tissue, the tissue secrete various vasodilator chemicals that acts on the arteriole to causes smooth muscle relaxation leading to dilatation of the arterioles so that blood supply to that area could be increased

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