The main jobs of the cardiovascular system are to carry blood and other nutrients to the body's cells and assist with the removal of wastes and carbon dioxide from the cells.

• A. False
• B. Sometimes
• C. Not Sure
• D. True

Answer: (D)

The main idea is that circulation serves as the transport system for the body. The heart and blood vessels move blood so tissues receive oxygen and nutrients, and so wastes like carbon dioxide are carried away to organs that excrete them. This description matches what the cardiovascular system does: delivering what cells need and gobbling up and removing what cells produce. It’s not only about moving blood, but about the continuous delivery of nutrients and the return of wastes, making the statement true.