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The Heart
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Vocabulary of the Heart
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Word
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Definition
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| Heart | A hollow muscular organ that pumps blood throughout the body |
| Cardovascular System | The body system that consists of the heart, blood vessels, and blood, that carries needed substances to cells and carries waste products away from the cells |
| Atrium | Each of the two upper chambers of the heart that receives blood that comes into the heart |
| Ventricle | Each of the two lower chambers of the heart that pumps blood out of the heart |
| Valve | A flap of tissue in the heart of a vein that prevents blood from flowing backward |
| Arteries | A blood vessel that carries blood away from the heart |
| Capillaries | A tiny blood vessel where substances are exchanged between the blood and the body cells |
| Veins | A blood vessel that carries blood back to the heart |
| Pacemaker | A group of cells located in the right atrium that send out signals that make the heart muscle contract and that regulates the heartbeat rate |
| Aorta | The largerst artery in the body |
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