21. Immune System
Adaptive Defenses: Cells
Problem 20.18a
Textbook Question
Textbook QuestionType I hypersensitivity is due to release of inflammatory mediators from_____, and type IV hypersensitivity is due to the actions of_____.
a. TH cells; macrophages
b. neutrophils; TH cells
c. B cells; TC cells
d. mast cells; TH cells
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