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the body system that consists of the heart, blood vessels, and blood, and that carries needed substances to cells and carries waste products away from cells
a group of cells located in the right atrium that sends out signals that make the heart muscle contract and that regulates heartbeat rate
receives blood from the body, the blood is low in oxygen and high in waste produce carbon dioxide
thick muscular wall separates the left side of the heart from the right side. prevents oxygen rich and osygen poor blood from mising in the heart
loop 2 function
blood is pumped from the heart throught the body and then returns again to the heart
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