The spleen, thymus gland, tonsils, and lymph nodes are:
Concerned only with destroying RBCs
Confined to the thoracic cavity
Lymphoid organs
Concerned only with phagocytosis
The Correct Answer is C
A. Concerned only with destroying RBCs
Only the spleen is partly involved in RBC destruction-this doesn’t apply to all listed organs.
B. Confined to the thoracic cavity
These organs are located in different parts of the body-e.g., spleen in the abdomen, lymph nodes throughout the body.
C. Lymphoid organs
These are all components of the lymphatic/immune system, involved in immune surveillance and lymphocyte production.
D. Concerned only with phagocytosis
While some have phagocytic activity (e.g., macrophages in lymph nodes), their functions go far beyond phagocytosis (e.g., immune cell activation).
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Related Questions
Correct Answer is C
Explanation
A. Specific immunity: B cells, T cells:
B cells and T cells are part of the adaptive (specific) immune system.
B. Mechanical barriers: skin, mucous membrane:
These are physical defenses against infection.
C. Chemical barriers: tears, saliva, stomach acid, B cells, T cells:
Tears, saliva, and stomach acid are chemical barriers. B cells and T cells are not chemical barriers; they are components of specific immunity.
D. First line of defense: skin, mucous membrane, tears, sneezing:
These are all part of the body's innate first-line defenses.
Correct Answer is B
Explanation
A. They are found only in lymph nodes
Lymphatic vessels are widespread throughout the body and not limited to lymph nodes.
B. They have large pores and follow the venous pathway
Lymphatic vessels have large, permeable walls and generally follow alongside veins, draining interstitial fluid back to circulation.
C. They closely follow the path of the aorta
Lymphatics follow venous, not arterial (aorta), pathways.
D. They are found only in the spleen
The lymphatic system is distributed systemically, not restricted to the spleen.
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