What specific cells attack tumor cells and virus-infected cells?
Neutrophils
Regulatory T cells
Natural killer (NK) cells
Memory T cells
The Correct Answer is C
A. Neutrophils are a type of white blood cell that primarily responds to bacterial infections and perform phagocytosis, not specifically attacking tumor or virus-infected cells.
B. Regulatory T cells help regulate the immune response and prevent excessive immune activity, but they do not directly attack tumor or virus-infected cells.
C. Natural killer (NK) cells are a type of lymphocyte that plays a key role in the body's defense against tumor cells and virus-infected cells by directly attacking and destroying them.
D. Memory T cells are responsible for "remembering" a previous pathogen, enabling a quicker response upon future exposure, but they do not directly attack tumor or virus-infected cells.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Suppression of the immune response is primarily carried out by regulatory T cells, not B cells.
B. B cells are responsible for the production of antibodies. When activated, they differentiate into plasma cells, which secrete antibodies that target specific antigens (pathogens).
C. Phagocytosis is mainly performed by macrophages and neutrophils, not by B cells.
D. Direct destruction of foreign cells is a function typically carried out by cytotoxic T cells, not B cells.
Correct Answer is A
Explanation
A. Serum sickness is the correct answer. It is a type III hypersensitivity reaction that can occur when the body reacts to proteins in animal-derived immune serum, often used in treatments like antitoxins or antivenoms. Symptoms may include rash, fever, joint pain, and swelling.
B. Rejection syndrome typically refers to the immune system's rejection of transplanted organs or tissues, not a response to serum.
C. Kaposi sarcoma is a cancer associated with human herpesvirus 8 (HHV-8), most commonly seen in immunocompromised individuals, such as those with AIDS. It is unrelated to immune serum reactions.
D. Hay fever (allergic rhinitis) is an allergic reaction to airborne substances like pollen, not to animal-derived serum
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