What accumulates in lymph nodes during an active viral infection? Identify the best description of the contents and structures present.
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AHuge numbers of white blood cells
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BTrapped viruses that have been roaming the body
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CLymph ducts that enter and exit the nodes and lymph fluid
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DAll of the above
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EOnly red blood cells and plasma proteins
Answer
Correct Answer: All of the above
Explanation
Introduction:Lymph nodes are hubs for immune surveillance and response. During infections like the common cold, nodes enlarge due to cellular recruitment and proliferation, while lymph-borne antigens and pathogens are filtered and retained.
Given Data / Assumptions:
- Nodes receive afferent lymph containing antigens, pathogens, and dendritic cells.
- Germinal centers form with proliferating B cells and helper T cells.
- Anatomical lymphatic vessels enter and exit nodes.
Concept / Approach:
All listed features coexist during active responses: abundant leukocytes, trapped antigens/pathogens, and the lymphatic conduits that shuttle lymph through the node’s architecture.
Step-by-Step Solution:
1) Recognize node swelling results from leukocyte accumulation and proliferation.2) Understand that subcapsular sinuses filter lymph, capturing virus/antigen.3) Note the structural presence of afferent/efferent lymphatics and continuous lymph flow.4) Therefore, the inclusive option listing all three is correct.Verification / Alternative check:
Histology and imaging show increased cellularity, antigen deposition on follicular dendritic cells, and well-defined lymphatic vessels during infections.
Why Other Options Are Wrong:
Options A, B, C each capture part of the truth but are incomplete alone.
Option E: Red blood cells are not typical residents; nodes are lymphoid, not hematologic filtration organs like the spleen.
Common Pitfalls:
Confusing lymph nodes with spleen (blood-borne antigen) or assuming nodes only contain fluid without significant cellular dynamics.
Final Answer:
All of the above