Which of the following is a component of the lymphatic system?

• A. Lymph nodes
• B. Esophagus
• C. Heart
• D. Liver

Answer: (A)

The main concept is recognizing parts of the lymphatic system. Lymph nodes are small, bean-shaped organs along lymph vessels that filter lymph and host immune cells, helping to trap pathogens and coordinate immune responses. This makes them a clear component of the lymphatic system, alongside the network of lymph vessels and other lymphoid organs like the spleen, thymus, and tonsils.

The other listed organs belong to different systems: the esophagus is part of the digestive system and transports food to the stomach; the heart is part of the circulatory system and pumps blood; the liver is a metabolic and digestive organ involved in processes like bile production and detoxification. None of these are primary components of the lymphatic system, whereas lymph nodes are.