Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 22 of 99
Secondary lymphoid organs where mature recirculating lymphocytes routinely encounter antigens and initiate adaptive immune responses include the:
A
Lymph node
B
Bone marrow stem cells
C
Thymic cortex
D
Systemic capillary lumen
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Lymph node
Concept: Primary vs. Secondary lymphoid structures.

Solution: Lymph nodes are encapsulated secondary lymphoid organs distributed along lymphatic vessels. They filter lymph fluid and serve as crucial meeting hubs where APCs present foreign antigens to resident naive B and T cells.

Why other options are incorrect:
  • Option B & Option C: Bone marrow and thymus are primary lymphoid organs responsible for lymphocyte generation and maturation, not primary antigen filter activation.

  • Option D: Capillary lumens are systemic blood channels, not structured lymphoid tissues.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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