Which body system is primarily responsible for transporting blood and lymph throughout the body?

Which body system is primarily responsible for transporting blood and lymph throughout the body?

• A. Nervous
• B. Circulatory
• C. Respiratory
• D. Endocrine

Answer: (B)

Transporting circulating fluids through the body is the job of the circulatory system. It moves blood via the heart, arteries, veins, and capillaries to deliver oxygen and nutrients to tissues and to remove wastes. Lymphatic flow is a closely related system that drains excess tissue fluid and returns it to the bloodstream, effectively linking with the circulatory system. Because this system governs the movement of these essential fluids throughout the body, it’s the best fit for the described role. The nervous system coordinates functions, the respiratory system handles gas exchange, and the endocrine system distributes hormones—none of these primarily move blood and lymph through the body.

Transporting circulating fluids through the body is the job of the circulatory system. It moves blood via the heart, arteries, veins, and capillaries to deliver oxygen and nutrients to tissues and to remove wastes. Lymphatic flow is a closely related system that drains excess tissue fluid and returns it to the bloodstream, effectively linking with the circulatory system. Because this system governs the movement of these essential fluids throughout the body, it’s the best fit for the described role. The nervous system coordinates functions, the respiratory system handles gas exchange, and the endocrine system distributes hormones—none of these primarily move blood and lymph through the body.