Functions of the heart:

• it helps in the circulation of oxygen rich blood throughout the body by the pumping.
• it receives oxygenated blood from the lungs.
• it also ponds back the blood carrying carbon dioxide to the lungs.
• it shows rhythmic contraction and relaxation for movement of blood.

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Explanation:

The heart is a muscular organ in most animals, which pumps blood through the blood vessels of the circulatory system.[1] The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbon dioxide to the lungs.[2] In humans, the heart is approximately the size of a closed fist and is located between the lungs, in the middle compartment of the chest.