Which term describes the body system that circulates blood and lymph through the body, including the heart and glands?

• A. Nervous system
• B. Endocrine system
• C. Digestive system
• D. Circulatory system

Answer: (D)

Circulating blood and lymph through the body is the function of the circulatory system. The heart acts as the pump that moves blood through vessels, delivering oxygen and nutrients to tissues. Lymph is carried by the lymphatic system, which works alongside the circulatory system to maintain fluid balance and support immunity. While glands are part of the endocrine system, which distributes hormones via the bloodstream, the system that directly moves blood and lymph is the circulatory system. The nervous system governs signals and control, and the digestive system handles breaking down and absorbing nutrients. So the circulatory system best fits the description.