What is the collective term for the heart, blood vessels, and blood?

• A. Circulatory Pathway
• B. Blood Network
• C. Heart System
• D. Cardiovascular System

Answer: (D)

This question tests naming the body system responsible for circulating blood. The standard term for the heart, blood vessels, and blood is the cardiovascular system. The heart acts as a muscular pump, the blood vessels form the pathways that carry blood through the body, and the blood itself is the transport fluid that carries oxygen, carbon dioxide, nutrients, hormones, and immune cells. Together, these components enable circulation, gas exchange, and delivery and removal of substances to and from tissues. The other phrases aren’t the conventional name for this whole group, so cardiovascular system is the precise term.