A characteristic that defines a tissue as primary vs. secondary lymphoid tissue is:
A) Activated cells reside in primary and resting cells reside in secondary lymphoid tissue
B) The quantity of cells in each
C) Primary tissue is composed of only T cells and secondary tissue is composed of only B cells
D) Immunocompetent T and B cells further divide into memory and effector cells in secondary tissue

Question

Quizplus · Accepted Answer

The characteristic that defines a tissue as primary vs. secondary lymphoid tissue is that immunocompetent T and B cells further divide into memory and effector cells in secondary tissue. Primary lymphoid tissue is where T and B cells mature and develop their antigen receptors, while secondary lymphoid tissue is where these cells become activated upon encountering their specific antigen and proliferate to form effector and memory cells. Therefore, the presence of memory and effector cells is a defining characteristic of secondary lymphoid tissue.

A Characteristic That Defines a Tissue as Primary Vs