Photo de stock - The heart is the organ that makes blood circulate. Its muscle, the myocardium, receives stimulation from nerves, then contracts and propels the blood around the body. It is composed of 4 cavities, 2 atria and 2 ventricles. Each ventricle corresponds to an

Photo de stock: The heart is the organ that makes blood circulate. Its muscle, the myocardium, receives stimulation from nerves, then contracts and propels the blood around the.

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