What is the function of lymph nodes?

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Multiple Choice

What is the function of lymph nodes?

Lymph nodes serve as filtering and immune-activation sites for lymph. As lymph flows through a node, macrophages ingest pathogens and debris, and lymphocytes scan for antigens, launching an immune response if anything unfamiliar is present. This purification and surveillance happens before lymph returns to the bloodstream, helping prevent pathogens from circulating widely. Other choices don’t fit because red blood cell production occurs in bone marrow, not lymph nodes; filtering cholesterol from blood is a liver/spleen function (with the spleen playing a secondary, not primary, role in filtering lipids); and lymph is not stored in lymph nodes—the fluid continuously circulates, being filtered as it passes through lymph nodes along its route back to the venous system.

Lymph nodes serve as filtering and immune-activation sites for lymph. As lymph flows through a node, macrophages ingest pathogens and debris, and lymphocytes scan for antigens, launching an immune response if anything unfamiliar is present. This purification and surveillance happens before lymph returns to the bloodstream, helping prevent pathogens from circulating widely.

Other choices don’t fit because red blood cell production occurs in bone marrow, not lymph nodes; filtering cholesterol from blood is a liver/spleen function (with the spleen playing a secondary, not primary, role in filtering lipids); and lymph is not stored in lymph nodes—the fluid continuously circulates, being filtered as it passes through lymph nodes along its route back to the venous system.

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