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  • 17-12-2017
  • Health
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What muscle contracts in the heart to eject the blood from the heart? A. Aorta B. Caudal vena cava C. Atrioventricular node D. Myocardium

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phuocnguyenchu phuocnguyenchu
  • 31-12-2017
D. Myocardium. Mabye
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