What is the primary role of cytotoxic T cells during cell-mediated immunity?
Recognizing antigens presented by macrophages.
Producing antibodies against pathogens.
Directly attacking and killing infected cells.
Regulating the immune response to prevent excessive inflammation.
The Correct Answer is C
Explanation: Cytotoxic T cells (CD8+ T cells) are the effector cells of cell-mediated immunity. Their primary role is to directly recognize and kill infected or abnormal cells, such as virus-infected cells or cancer cells. Cytotoxic T cells release cytotoxic granules containing perforin and granzymes, which induce apoptosis (cell death) in the target cells.
Incorrect choices:
a. Helper T cells, not cytotoxic T cells, recognize antigens presented by macrophages and play a crucial role in activating other immune cells.
b. B cells are responsible for producing antibodies against pathogens during the humoral immune response, not cytotoxic T cells.
d. Regulatory T cells (suppressor T cells) are involved in regulating the immune response to prevent excessive inflammation and tissue damage, not cytotoxic T cells.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Explanation: At 2 months of age, infants are recommended to receive the DTaP vaccine, which protects against diphtheria, tetanus, and pertussis (whooping cough). The MMR vaccine protects against measles, mumps, and rubella and is usually administered at a later age. The hepatitis B vaccine is given shortly after birth, and the varicella vaccine is typically administered at 12 months of age.
Incorrect choices:
a. The MMR vaccine protects against measles, mumps, and rubella, not whooping cough (pertussis).
b. The hepatitis B vaccine is typically given shortly after birth, not at 2 months of age.
d. The varicella vaccine is usually administered at 12 months of age, not at 2 months.
Correct Answer is B
Explanation
Explanation: Sjögren's syndrome is an autoimmune disorder in which the immune system attacks and damages the salivary and lacrimal glands, resulting in dry eyes and dry mouth.
Incorrect choices:
a. Rheumatoid arthritis primarily affects the joints, causing inflammation and joint damage.
c. Crohn's disease is an autoimmune disorder that affects the gastrointestinal tract, leading to inflammation and ulcers.
d. Psoriasis is a chronic skin condition characterized by red, scaly patches on the skin, and it is not related to the salivary and lacrimal glands.
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