What is the main role of the nervous system in the return of blood to the heart?
A. Assisting in the distribution of blood to different organs
B. Pushing or massaging blood back to the heart with each muscle contraction
C. Causing veins to slightly constrict to return more blood to the heart
D. Creating a difference in pressure between the veins in the chest and abdominal cavities
Preview next quiz:
Which type of blood vessels have very thick muscular walls and carry blood away from the heart?
A. Arterioles
B. Capillaries
C. Arteries
D. Venules
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