The heart is a muscular organ that pumps blood. Blood that contains waste materials is brought to the heart by blood vessels. This blood enters the right atrium and then moves down. The presence of the atrioventricular valve prevents the backflow of blood inside the heart.
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Blood containing waste materials is transported back to the heart via veins. This deoxygenated blood enters the heart through the superior and inferior vena cava. Show more…
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