Lymph nodes detect foreign antigens in the lymph.

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Multiple Choice

Lymph nodes detect foreign antigens in the lymph.

Explanation:
Lymph nodes surveil the lymph, the fluid that drains tissues and carries antigens toward the nodes. Antigen-presenting cells inside the nodes capture these foreign substances in the lymph and present them to T and B lymphocytes, kickstarting the adaptive immune response. This setup ensures that immune activation is triggered where antigens travel in the lymph. Other fluids have different roles: blood circulates throughout the body and is cleaned by organs like the spleen; urine is waste filtered by the kidneys; bone marrow is where immune cells are produced, not where antigens in the lymph are detected.

Lymph nodes surveil the lymph, the fluid that drains tissues and carries antigens toward the nodes. Antigen-presenting cells inside the nodes capture these foreign substances in the lymph and present them to T and B lymphocytes, kickstarting the adaptive immune response. This setup ensures that immune activation is triggered where antigens travel in the lymph.

Other fluids have different roles: blood circulates throughout the body and is cleaned by organs like the spleen; urine is waste filtered by the kidneys; bone marrow is where immune cells are produced, not where antigens in the lymph are detected.

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