Which is the primary organ of the circulatory system?
A) Lungs
B) Heart
C) Liver
D) Kidneys
Correct Answer:
B) Heart
Explanation:
The primary organ of the circulatory system is the heart. The heart is responsible for pumping blood throughout the body, ensuring that oxygen and nutrients are transported to cells and waste products are removed. It plays a central role in maintaining circulation and is essential for the functioning of the entire circulatory system.
