Cytotoxic T-Cells _
Correct answer: A. Directly kill invaders
- A. Directly kill invaders
- B. Aid B cells in their job
- C. Both a and b
- D. Suppress T cell activity
Explanation
Cytotoxic T-cells (also known as CD8+ T-cells) are a type of immune cell that directly kill infected cells, cancer cells, or cells that have been damaged in other ways. They recognize and bind to antigens presented by infected or abnormal cells and release toxic substances, such as perforin and granzymes, that lead to the destruction of the targeted cells.
This question appeared on the KMU MDCAT 2023 (retake) paper, which you can sit online with every answer explained.
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Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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