The heart is a biological pump that creates pressure to send nutrient- and oxygen-rich blood through circulatory vessels to supply body organs. The heart is an example of an organ.
The heart pumps blood via the network of arteries and veins called the cardiovascular system.
The ventricles are the chambers that pump blood, and the atria are the chambers that receive blood. The right atrium and ventricle together make up the right heart, and the left atrium and ventricle together make up the left heart. The structure of the heart also houses the body's largest artery, the aorta.
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