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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The portal of entry is the specific site or pathway through which a pathogen enters the body, such as the skin, mucous membranes, or respiratory and digestive tracts.
B. Blood is not the site of entry but rather a medium that can carry pathogens throughout the body once they have entered through a portal of entry.
C. The respiratory tract is a common portal of entry for many pathogens (like viruses or bacteria), but it is just one example of a portal of entry, not the general term for it.
D. Inflammation is an immune response to infection or injury, not a site of entry for
Correct Answer is D
Explanation
A. Oxygen delivery to tissues is the primary function of the circulatory system, not the lymphatic system.
B. Thermoregulation is primarily carried out by the circulatory system and other mechanisms like sweating, not the lymphatic system.
C. The transport of absorbed amino acids from the intestine to the liver is a function of the circulatory system, specifically through the hepatic portal vein, not the lymphatic system.
D. The lymphatic system is involved in the absorption of digested fats through specialized lymphatic capillaries called lacteals in the small intestine. These lacteals absorb fats and transport them into the lymphatic circulation.
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