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

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Medical Sciences

  1. The walls of the veins contain smooth muscle which isinnervated by sympathetic nerve fibers. Sympathetic stimulation____________ venous vasoconstriction and drives __________ bloodinto the heart. Fill in the blanks with one of the following termcombinations.

increases / more

increases / less

decreases / more

decreases / less

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4.4 Ratings (823 Votes)

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


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