The answer is C. Unexplainable muscle weakness or pain.
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The answer should be B.
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I think the answer to that question would have to be a because its the most reasonable
Answer:
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.
