Hay fever that occurs when people are exposed to pollen involves an excess release of IgE, which binds to ________ and causes them to ________.
A) pollen : stimulate the release of histamine
B) macrophages : destroy the pollen whose by-products stimulate histamine release
C) T helper cells : stimulate the proliferation of cytotoxic T cells
D) mast cells : degranulate, releasing histamine
E) mast cells : stimulate the proliferation of cytotoxic T cells
Ans: D) mast cells : degranulate, releasing histamine
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