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

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

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Question Text	Which of the following statements regarding circulation is true? Muscle contraction tends to pull blood downward into the lower parts of the body of a terrestrial vertebrate Valves in veins and muscle contractions pressing against veins slow down the return of blood to the heart Gravity does not affect blood moving through the circulatory system An standing giraffe requires a great deal more pressure to pump blood to head than an animal with a shorter neck Listen
Topic	All topics
Subject	Biology
Class	Class 12

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