A) Circulate Blood
B) Blood Clotting
C) Pumping Blood
D) Both A and C
Correct answer is option D

Main Function of the Heart
The heart is a vital organ in the human body responsible for pumping blood throughout the circulatory system. Here are the main functions of the heart:
- Circulation of Blood: The primary function of the heart is to pump oxygen-rich blood to all parts of the body and deliver nutrients and oxygen to cells while removing waste products.
- Maintaining Blood Pressure: The heart helps regulate blood pressure by adjusting the force and rate at which blood is pumped through the arteries.
- Transportation of Nutrients: The heart ensures that essential nutrients such as glucose, amino acids, and fatty acids are transported to cells for energy production and growth.
- Removal of Waste: In addition to supplying nutrients, the heart also helps remove waste products such as carbon dioxide and metabolic byproducts from cells.
- Regulation of Body Temperature: The heart plays a role in regulating body temperature by distributing heat generated during metabolism throughout the body.
- Immune Response: The heart is involved in the immune response by transporting white blood cells and antibodies to fight off infections and diseases.
In conclusion, the heart serves as the central pump of the circulatory system, ensuring the proper functioning of all body tissues and organs by maintaining a steady supply of oxygen and nutrients while removing waste products. It is essential for overall health and well-being.