________ are small bean-shaped structures that filter substances and fight infection in the body.

________ are small bean-shaped structures that filter substances and fight infection in the body.

• A. Liver
• B. Lymph Nodes
• C. Tonsils
• D. Spleen

Answer: (B)

Lymph nodes are small bean-shaped structures along the lymphatic vessels where lymph is filtered and immune cells—like lymphocytes and macrophages—are ready to respond to pathogens. This filtering process traps bacteria, viruses, and other invaders and helps coordinate the immune response, which is why they’re described as fighting infection. The bean shape and their role in filtering lymph distinguish them from other organs: the liver metabolizes and detoxifies substances, the spleen filters blood rather than lymph, and tonsils are lymphoid tissue in the throat that helps catch pathogens but aren’t the small, distributed filtering nodes along the lymphatic system.

Lymph nodes are small bean-shaped structures along the lymphatic vessels where lymph is filtered and immune cells—like lymphocytes and macrophages—are ready to respond to pathogens. This filtering process traps bacteria, viruses, and other invaders and helps coordinate the immune response, which is why they’re described as fighting infection. The bean shape and their role in filtering lymph distinguish them from other organs: the liver metabolizes and detoxifies substances, the spleen filters blood rather than lymph, and tonsils are lymphoid tissue in the throat that helps catch pathogens but aren’t the small, distributed filtering nodes along the lymphatic system.