A) beating of heart
B) squeezing effect of muscles upon veins running through them
C) peristaltic wave that travel along the alimentary canal
D) None of the above
Correct Answer: B
Solution :
During contraction muscles show squeezing effect upon vein running through them, which is known as muscle pump. Beating of heart produces characteristic sound lubb (first-sound) and dup (second sound). Peristalsis is a wave of progressive contraction and distension, which is useful in propelling food through the digestive tract.
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