1. Concept:The immune system relies on specialized white blood cells to mediate innate and adaptive defenses. Long-term specific immunity (humoral and cell-mediated immunity) is orchestrated by lymphocytes (B-cells and T-cells).
2. High-Yield PYQ Note:This question is a high-yield medical entrance staple that appeared in both
PMC-2020 and
NUMS-2023.
3. Solution:- Lymphocytes: Key effectors of adaptive immunity. B-lymphocytes synthesize antibodies (humoral defense), while T-lymphocytes govern cell-mediated cytotoxicity and immune coordination.
4. Why other options are incorrect:- Monocytes: Phagocytic agranulocytes that mature into tissue macrophages; part of the innate first/second line of defense.
- Neutrophils: Short-lived granulocytic phagocytes active in acute bacterial infection.
- Thrombocytes: Platelets involved in hemostasis and blood clotting, not developing specific immunity.
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