Question

For the following multiple choice question, identify what you believe to be the correct answer. Then, in one to three sentences, concisely explain why you believe that your chosen answer is the correct one (as opposed to the other answer choices).

If systemic blood pressure decreased, the __________ mechanism would stimulate the local arteriole feeding a capillary bed to _________, _________ perfusion back to the normal rate.

A. metabolic; vasoconstrict; decreasing

B. metabolic; vasodilate; increasing

C. myogenic; vasoconstrict; decreasing

D. myogenic; vasodilate; decreasing

E. myogenic; vasodilate; increasing

Answer 1

Let's derive the answer from the question,

Here, the question says the local arteriole mechanism that would stimulate. This is actually the part of the definition of myogenic mechanism where the local arteries and arteriole regulate their blood flow by contracting and relaxing based on the blood pressure to make sure that the local area is getting blood.

So, first blank is myogenic mechanism.

Metabolic mechanism does not play role in the local conditions. So this option is eliminated.

Second blank- the answer is vasodilate. When the local blood pressure drops, due to systemic low blood pressure, these local myogenic mechanism helps the local tissue by causing the smooth muscles to relax. Which causes vasodilation.

Vasoconstriction does the opposite effect by further reducing the blood flow to the local area. Which we do not want.

Third blank- the answer is increasing (the blood flow). As discussed in the second blank- that the smooth muscles of arteioles and arteries cause vasodilation in this situation, this vasodilation causes increased blood flow to the area. It's just like if we increase the diameter of the vessel, obviously more volume it covers. So is the blood, when they vasodilate more blood occupies and keeps the area supplied with nutrients.

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