The lymphatic system's contribution to immunity is best described as what?

• A. It defends against disease and infection.
• B. It stores bile.
• C. It regulates body temperature.
• D. It digests carbohydrates.

Answer: (A)

Defense against disease and infection is the central idea here. The lymphatic system moves lymph that carries immune cells and houses immune-processing organs such as lymph nodes, the spleen, and the thymus. Lymph nodes act as filtering stations, trapping pathogens as lymph flows through and presenting them to B and T cells so the body can recognize and respond to invaders. The spleen helps surveil the bloodstream for foreign antigens and supports antibody production. Altogether, these components coordinate pathogen detection, immune activation, and the orchestration of the body’s defense against infections.

Storing bile is the job of the biliary system with the liver and gallbladder. Regulating body temperature involves the nervous system and skin. Digesting carbohydrates is handled by the digestive system with enzymes like amylase.