structure of heart
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The heart is divided into four chambers consisting of two atria and two ventricles; the atria receive blood, while the ventricles pump blood. ... The heart is composed of three layers: the epicardium (outer layer), the myocardium (middle layer), and the endocardium (inner layer).
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The human heart is a four-chambered muscular organ, shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline.
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