Antibodies and T lymphocytes are the respective mediators of which two types of immunity?
A. Innate and adaptive
B. Passive and active
C. Specific and nonspecific
D. Humoral and cell-mediated
E. Adult and neonatal
ANS: D. Both B and T lymphocytes are principal components of adaptive immunity. B lymphocytes produce antibodies, which are the recognition and effector molecules of humoral immune responses to extracellular pathogens. T cells recognize and promote eradication of intracellular pathogens in cell-mediated immunity. Passive and active immunity both can be mediated by either B or T lymphocytes. Specific immunity is another term for adaptive immunity. Both B and T lymphocytes participate in adult adaptive immunity but are still developing in the neonatal period.
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