Lymph nodes
A) produce enzymes in the lymph.
B) are part of the respiratory system.
C) are where macrophages congregate and filter pathogens from the lymph.
D) produce antibodies and antigens.

Question

Quizplus · Accepted Answer

Lymph nodes are part of the lymphatic system and act as filters to remove pathogens from lymph fluid (not enzymes or antibodies/antigens). Macrophages are immune cells that congregate in lymph nodes to help eliminate foreign substances. Lymph nodes are not part of the respiratory system.

Lymph Nodes