Every time the heart contracts, blood flows into the (a) arteries (b) veins (c) heart
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veins
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c) heart
Explanation:
Blood first enters the heart's right atrium. A muscle contraction forces the blood through the tricuspid valve into the right ventricle. When the right ventricle contracts, blood is forced through the pulmonary semilunar valve into the pulmonary artery. Then it travels to the lungs.
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