The walls of the veins contain smooth muscle which is innervated by sympathetic nerve fibers. Sympathetic...

The walls of the veins contain smooth muscle which is innervated by sympathetic nerve fibers. Sympathetic stimulation ____________ venous vasoconstriction and drives __________ blood into the heart. Fill in the blanks with one of the following term combinations.

		increases / more
		increases / less
		decreases / more
		decreases / less

Expert Solution

ANSWER: increases / less

RATIONALE: vasoconstriction is the thickening or narrowing of the blood vessels. When it narrow the pressure in the blood vessels get increased.

so increased vasoconstriction will leads the veins to transfer less of blood to the heart and it fills the heart. Because due to the increased blood pr

Sydney Mullin answered 2 years ago

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