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The heart is the toughest working muscle in the human body. Located almost in the middle of the chest, a healthy adult coronary heart is the scale of a clenched grownup fist. By age 70, the human coronary heart will beat greater than 2.5 billion occasions. The heart is all the time working. It pumps about 2,000 gallons of blood day by day. A child's coronary heart works simply as laborious as an adult's coronary heart. Actually, at rest, a baby's heart might beat up to 130 to one hundred fifty occasions a minute. An adult's coronary heart often beats between 60 and 100 occasions a minute, at rest. The speed at which the center pumps steadily slows down from birth to teen years. The cardiovascular system is made up of the center and blood vessels. It circulates blood throughout the body. A healthy cardiovascular system is important to supplying the physique with oxygen and nutrients. The heart is a big, muscular organ that pumps blood crammed with oxygen and nutrients through the blood vessels to the body tissues. Four chambers. The 2 higher chambers are the atria. They receive and acquire blood. The 2 lower chambers are the ventricles. They pump blood to other components of your physique. The proper atrium receives blood from the physique. This blood is low in oxygen. This is the blood from the veins. The fitting ventricle pumps the blood from the right atrium into the lungs to choose up oxygen and take away carbon dioxide. The left atrium receives blood from the lungs. This blood is wealthy in oxygen. The left ventricle pumps the blood from the left atrium out to the body, supplying all organs with oxygen-wealthy blood. 4 valves. The four valves are the aortic, pulmonary, mitral, and tricuspid valves. They let blood flow ahead and stop the backward circulation.
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