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1. Heart ➤ It is a hollow muscle (just big as your fist) that pumps the blood throughout the body. It has four chambers with specific tasks to do: two ventricles and two atria (sing. atrium) or auricles. The atria are the receiving chambers of the heart, accepting blood from the body (right atrium) and from the lungs (left atrium). The ventricles are the pumping chambers, moving blood to the lungs (right ventricle) and into the body (left ventricle). Figur Sour​