What Is the Mechanism in Type IV Hypersensitivity Reactions

question 4

Multiple Choice

What is the mechanism in type IV hypersensitivity reactions?

• A) Antibodies coat mast cells by binding to receptors that signal its degranulation followed by discharge of preformed mediators.
• B) Antibodies bind to soluble antigens that were released into body fluids and the immune complexes are deposited in the tissues.
• C) Cytotoxic T lymphocytes or lymphokines-producing Th1 cells attack and destroy cellular targets directly.
• D) Antibodies bind to the antigen on the cell surface.

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