Which organ is responsible for pumping blood throughout the body?

The heart is responsible for pumping blood throughout the body. It functions as a muscular organ that contracts rhythmically to circulate blood, which carries oxygen and nutrients to tissues and removes waste products like carbon dioxide. The heart contains four chambers: the right atrium, right ventricle, left atrium, and left ventricle, which work in a coordinated manner to ensure efficient blood flow.

While other organs listed, such as the stomach, liver, and kidneys, play important roles in bodily functions—like digestion, metabolism, and waste filtration—they do not pump blood. The stomach helps in breaking down food, the liver processes nutrients and detoxifies harmful substances, and the kidneys filter waste from the blood to produce urine. Therefore, the heart's unique role in blood circulation distinguishes it as the key organ for pumping blood throughout the body.