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.
A. sympathetic; active hyperemia; dilation; extrinsic; intrinsic
B. parasympathetic; reactive hyperemia; dilation; extrinsic; intrinsic
C. parasympathetic; active hyperemia; constriction; extrinsic; intrinsic
D. sympathetic; reactive hyperemia; dilation; intrinsic; extrinsic
E. sympathetic; flow autoregulation; constriction; intrinsic; extrinsic
Answer: A
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