Questions: T cells migrate to the thymus to mature and B cells mature in the bone marrow where they develop immunocompetence and self-tolerance. Clonal selection Cells become effector and memory cells. Cells are exported from the primary lymphoid organs to seed (colonize) the secondary lymphoid organs.

T cells migrate to the thymus to mature and B cells mature in the bone marrow where they develop immunocompetence and self-tolerance. Clonal selection Cells become effector and memory cells. Cells are exported from the primary lymphoid organs to seed (colonize) the secondary lymphoid organs.
Transcript text: T cells migrate to the thymus to mature and B cells mature in the bone marrow where they develop immunocompetence and self-tolerance. Clonal selection Cells become effector and memory cells. Cells are exported from the primary lymphoid organs to seed (colonize) the secondary lymphoid organs.
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Solution

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Solution Steps

Step 1: Locate "B" in the diagram

The prompt asks us to identify the physiology in lymphocyte development indicated by "B." "B" is pointing to the red bone marrow, where lymphocyte precursors are shown.

Step 2: Relate B's location to lymphocyte development

Lymphocyte precursors originate in the bone marrow.

Step 3: Find the matching answer choice

The answer choice that corresponds to the origin of lymphocyte precursors is "Originates from hematopoietic stem cells". Hematopoietic stem cells reside in the bone marrow and give rise to all blood cell lineages, including lymphocytes.

Final Answer: The correct answer is "Originates from hematopoietic stem cells".

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