The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium. They let blood flow forward and prevent the backward flow.īlood vessels. These bring blood to the lungs, where oxygen enters the bloodstream, and then to the body: The 4 valves are the aortic, pulmonary, mitral, and tricuspid valves. The left ventricle pumps the blood from the left atrium out to the body, supplying all organs with oxygen-rich blood.Ĥ valves. The left atrium receives blood from the lungs. The right ventricle pumps the blood from the right atrium into the lungs to pick up oxygen and remove carbon dioxide. The right atrium receives blood from the body. They pump blood to other parts of your body. The heart is a large, muscular organ that pumps blood filled with oxygen and nutrients through the blood vessels to the body tissues. A healthy cardiovascular system is vital to supplying the body with oxygen and nutrients. The cardiovascular system is made up of the heart and blood vessels. The rate at which the heart pumps gradually slows down from birth to teen years. An adult's heart often beats between 60 and 100 times a minute. In fact, at rest, a baby's heart may beat up to 130 to 150 times a minute. It pumps about 2,000 gallons of blood daily.Ī child's heart works just as hard as an adult's heart. Located almost in the center of the chest, a healthy adult heart is the size of a clenched adult fist. By age 70, the human heart will beat more than 2.5 billion times. The heart is the hardest working muscle in the human body.
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