BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS
BLOOD
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What keeps blood from flowing backwards in the heart?
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atrium
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valves
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artery
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None of the above
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Explanation:
Detailed explanation-1: -The aortic and pulmonic valves close, preventing backward blood flow into the heart. The mitral and tricuspid valves then open to allow forward blood flow within the heart to fill the ventricles again.
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