explain the working of heart
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The strong muscular walls contract (squeeze), pumping blood to the rest of the body. On the surface of theheart, there are coronary arteries, which supply oxygen-rich blood to theheart muscle itself. ... The atria and ventricles work together, contracting and relaxing to pump blood out of theheart
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Deoxygenated blood returns via veins to the venae cavae, re-entering the heart's right atrium. Of course, the heart is also a muscle, so it needs a fresh supply of oxygen and nutrients, too, Phillips said. The cardiovascular system circulates blood from the heart to the lungs and around the body via blood vessels.
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