Nokea
The nurse is reviewing the immune system prior to discussing the actions with a patient. What type of cell should the nurse identify that is involved in cell-mediated immunity and has a cytotoxic action on tumor cells?
Correct Answer: C
Rationale: The correct answer is C: Natural killer cells. Natural killer cells are involved in cell-mediated immunity and have cytotoxic actions on tumor cells. They are part of the innate immune system and can directly kill infected or cancerous cells. Lysosomes (A) are organelles within cells that break down waste materials. Memory cells (B) are a type of immune cell that "remembers" previous infections to mount a faster response upon re-exposure. Histocompatibility cells (D) are involved in recognizing self from non-self in transplant situations, not in cytotoxic actions on tumor cells.