The nurse knows high incidences of infectious illnesses among the older adults who reside in a long-term care facility are most likely to have diminished immune capacity because of
A)
decreased numbers and responsiveness of T lymphocytes.
B)
decreased antigen recognition by B lymphocytes.
C)
overexpression of cytokines and receptors.
D)
altered function in peripheral lymphocytes.
Ans:
A
Feedback:
Although this phenomenon is not well understood, increasing proportions of lymphocytes become unresponsive with age, and CD4+ T lymphocytes are the most severely affected. B lymphocytes recognize more antigens, not fewer, and expression of cytokines and their cellular receptors decreases.
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