Asked Oct 28, 2019
Which of the following mechanisms used in the control of vascular resistance would function as a result of the tissue being released from an occlusion?

Active hyperemia
Reactive hyperemia
Myogenic response
The paracrine agent endothelin-1

Expert Answer

Step 1

Vascular resistance is the resistance that must be overcome to push blood through the circulatory system and create flow. When blood vessels dilate, the blood flow is increased due to a decrease in vascular resistance. Therefore, dilation of arteries and arterioles leads to an immediate decrease in arterial blood pressure and heart rate.

Step 2

Reactive hyperemia is the transient increase in organ blood flow that occurs following a brief period of ischemia. It is the temporary increase in blood flow after a period of arterial occlusion. So, the correct option is  (B) Reactive hyperemia.

Step 3

Active hyperemia refers to the increase in organ blood flow that is associated with the increased metabolic activity of an organ or tissue. This type of active hyperemia causes an increase in blood flow that accompanies muscle contraction. It usually happens when organs need more blood than usual. So, option (A) Active hyperemia, is incorrect.

Myogenic response is the contraction of a blood vessel that occurs when intravascular pressure is elevated. It does not result from the tissue being released ...

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