When the metabolic activity of an organ increases, blood flow through the arterioles supplying that organ increases. This response is referred to as active hyperemia and occurs because:

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there is an increase in activity in the sympathetic nerves which innervate the arterioles.

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the capillaries within the organ dilate.

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cardiac output has been increased in anticipation of the increased metabolic demand.

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the smooth muscle of the arterioles relaxes in response to local chemical factors.

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When the metabolic activity of an organ increases, blood flow through the arteri...

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