Which of the Following Statements Regarding Circulation Is True

question 3

Multiple Choice

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.

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