Most immune responses originate in
A)primary lymphoid structures.
B)macrophages.
C)the skin.
D)secondary lymphoid structures.
E)the liver.

Question

Quizplus · Accepted Answer

Immune responses are initiated in primary lymphoid structures such as the bone marrow and thymus, where immune cells develop and mature. However, these immature immune cells must travel to secondary lymphoid tissues (such as lymph nodes, spleen, and mucosa-associated lymphoid tissue) to encounter and respond to foreign pathogens. Therefore, the majority of immune responses originate in secondary lymphoid structures.

Most Immune Responses Originate in