Blood flow through most organs in the systemic circuit is regulated primarily by increasing or decreasing the ________ activity to arteriolar smooth muscles in the organ.Another form of regulation,called ________,depends upon the metabolic activity of the organ.Increased activity leads to increased interstitial fluid metabolites,which cause ________ of the arterioles.The former is a type of ________ regulation of blood flow;the latter is an example of ________ regulation.

Question

Quizplus · Accepted Answer

Blood flow through most organs in the systemic circuit is regulated primarily by sympathetic activity to arteriolar smooth muscles in the organ, which is an example of extrinsic regulation. Active hyperemia is a form of intrinsic regulation that depends upon the metabolic activity of the organ, and leads to the dilation of arterioles due to increased interstitial fluid metabolites. Reactive hyperemia is a form of extrinsic regulation that occurs when blood flow is temporarily occluded, and is not mentioned in the question. Therefore, the best choice is A.

Blood Flow Through Most Organs in the Systemic Circuit Is