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Pericardium

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Pericardium
The function of the heart is to pump blood around the body. It consists of 4 chambers, two upper called atria and two lower called ventricles. the right side of the heart receives deoxygenated blood from around the body and pumps this to the lungs via the pulmonary arteries. After oxygenation within the lungs the blood is then returned to the heart via the pulmonary veins into the left atrium.
The oxygenated blood is then pumped from the left side of the heart to the rest of the body.
Within the heart itself there are several layers. The pericardium is a covering of fibrous tissue covering the large blood vessels which enter and leave the heart. The epicardium is just within the pericardium and secrets a lubricating fluid, or serum which prevents
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