Which of the following is a function of the cardiovascular system?

• A. Digestion and Absorption
• B. Transport, Protection, Regulation
• C. Gas Exchange
• D. Temperature Control

Answer: (B)

The cardiovascular system has three broad, essential roles: transport, protection, and regulation. It transports oxygen, carbon dioxide, nutrients, hormones, and waste products through the blood to and from tissues. It provides protection by circulating immune cells and clotting mechanisms that help defend against pathogens and prevent bleeding. It also helps regulate the body's internal environment, distributing heat to help maintain temperature and aiding in maintaining pH and fluid balance.

Digestion and absorption belong to the digestive system, not the cardiovascular system. Gas exchange is primarily the job of the respiratory system, with blood carrying gases to and from tissues. Temperature control is a regulatory function that the cardiovascular system supports, but the most complete description of its roles is transport, protection, and regulation, which is why that option best fits.