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| consists of the heart, blood vessels, and blood; carries needed substances to cells and carries waste products away from cells AKA: circulatory system |
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| hollow, muscular organ that pumps blood throughout the body; located in center of chest; size of your fist |
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| upper chambers of the heart that receives blood that comes into the heart |
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| lower chambers of the heart that pumps blood out of the heart |
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| a flap of tissue that prevents blood from flowing backward; located between the ventricles and the large blood vessels that carry blood away from the heart |
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| a group of heart cells that sends out signals that make the heart muscle contract; located in the right atrium of the heart |
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| a blood vessel that carries blood away from the heart |
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| tiny, narrow vessels where substances are exchanged between the blood and body cells |
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| a blood vessel that carries blood back to the heart |
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