Which organ pumps oxygen-rich blood through the body?

• A. Liver
• B. Stomach
• C. Kidneys
• D. Heart

Answer: (D)

The heart acts as the body's pumping organ, pushing oxygen-rich blood to every cell. It has two sides that work together: the left side receives blood loaded with oxygen from the lungs and sends it out through the aorta to the whole body, delivering oxygen to tissues. The right side collects blood returning from the body and transfers it to the lungs to pick up more oxygen, completing the circuit. While organs like the liver, stomach, and kidneys perform essential tasks, they do not move blood through the entire body as a pump does. So, the organ that pumps oxygen-rich blood throughout the body is the heart.