Which of the following statements regarding circulation is true?
A) A standing giraffe requires a great deal more pressure to pump blood to its head than an animal with a shorter neck.
B) Muscle contraction tends to pull blood downward into the lower parts of the body of a terrestrial vertebrate.
C) Gravity does not affect blood moving through the circulatory system.
D) Valves in veins and muscle contractions pressing against veins slow down the return of blood to the heart.
Correct Answer:
Verified
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