Multiple Choice
A sentinel node is the first lymph node __________.
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20. The Lymphatic System
Secondary Lymphoid Organs: Lymph Nodes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is NOT a secondary lymphoid organ?
A
Lymph nodes
B
Spleen
C
Thymus
D
Tonsils
Verified step by step guidance1
Understand the role of lymphoid organs in the immune system. Lymphoid organs are categorized into primary and secondary based on their function in lymphocyte development and activation.
Primary lymphoid organs are where lymphocytes (B cells and T cells) are formed and mature. The main primary lymphoid organs are the bone marrow and the thymus.
Secondary lymphoid organs are where mature lymphocytes become activated. These include lymph nodes, the spleen, and tonsils.
Identify the thymus as a primary lymphoid organ. It is where T cells mature, distinguishing it from secondary lymphoid organs.
Conclude that the thymus is not a secondary lymphoid organ, while lymph nodes, the spleen, and tonsils are secondary lymphoid organs.
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