Question

type iii hypersensitivities involve ______.

○ cell - mediated destruction of foreign cells
○ complement - assisted cell lysis triggered by antibodies
○ reactions mediated by ige
◎ deposition of immune complexes

Explanation:

To determine the correct answer, we analyze each option based on knowledge of Type III hypersensitivities:

• "Cell - mediated destruction of foreign cells" is characteristic of Type IV (delayed - type) hypersensitivity, not Type III.
• "Complement - assisted cell lysis triggered by antibodies" is associated with Type II (cytotoxic) hypersensitivity, where antibodies bind to cell - surface antigens and activate complement for cell lysis.
• "Reactions mediated by IgE" are typical of Type I (immediate) hypersensitivity, like allergic reactions.
• "Deposition of immune complexes" is the defining feature of Type III hypersensitivity. Immune complexes (antigen - antibody aggregates) deposit in tissues, leading to inflammation and tissue damage.

Answer:

The correct option is: deposition of immune complexes (the option with the radio - button selected, which is the fourth option in the list: "deposition of immune complexes")