What is the best description of the lymphatic system?

• A. Drains excess fluid and waste products from the extremities
• B. Transports oxygen in the blood
• C. Filters toxins through the spleen
• D. Regulates body temperature

Answer: (A)

Fluid balance and immune transport are what this system centers on: it collects excess fluid that leaks from capillaries into tissues, drains it as lymph through a network of vessels, and returns it to the bloodstream, helping remove waste and support immune defense. Because of this, the description that best fits is draining excess fluid and waste products from tissues, including the extremities. The other statements describe functions of different systems: oxygen transport is done by blood, not the lymphatic system; the spleen filters blood rather than toxins through the lymphatic system; and body temperature regulation is controlled mainly by the hypothalamus and skin, not by the lymphatics.