Question

Although they are not a site of lymphocyte formation, _________ lymphatic structures provide sites where immune responses are initiated.

1) Primary
2) Secondary
3) Tertiary
4) Quaternary

Answer 1

Secondary lymphatic structures, which include lymph nodes and the spleen, are sites where immune responses are initiated as they are where lymphocytes mount adaptive immune responses.The correct option is 2).

Step-by-step explanation:

Although they are not a site of lymphocyte formation, secondary lymphatic structures provide sites where immune responses are initiated. Secondary lymphoid organs include structures such as the lymph nodes, spleen, and tonsils. While primary lymphoid organs like the bone marrow and thymus gland are where lymphocytes mature and proliferate, secondary lymphoid organs are where these lymphocytes actually mount adaptive immune responses after coming into contact with antigens.

Secondary lymphatic structures provide sites where immune responses are initiated. These include the tonsils, spleen, and lymph nodes. Unlike primary lymphatic organs, which are the sites of lymphocyte formation, these secondary organs filter lymph and store lymphocytes, allowing them to encounter and activate lymphocytes and initiate adaptive immune responses.