What is the primary function of the heart?

• A. To filter toxins.
• B. To regulate body temperature.
• C. To pump blood throughout the body.
• D. To produce hormones.

Answer: (C)

The main idea is that the heart acts as a powerful muscular pump to move blood through the circulatory system. By contracting and relaxing, it creates the pressure that pushes blood around the body, delivering oxygen and nutrients to tissues and removing wastes. The heart works in two loops: the right side sends deoxygenated blood to the lungs to be oxygenated, and the left side sends that oxygen-rich blood to the rest of the body. This pumping action is the core function that keeps circulation going. Toxins are filtered by the liver and kidneys, temperature regulation is mainly through the skin and metabolism, and hormones are produced by endocrine glands, not by the heart.