Which of the following statements about T cells is correct?
T cells are involved in the production of antibodies.
T cells directly attack and kill infected cells.
T cells are responsible for phagocytosis of pathogens.
T cells primarily mediate allergic reactions.
The Correct Answer is B
Correct answer: B
Explanation: T cells, specifically cytotoxic T cells (CD8+ T cells), are responsible for cell-mediated immunity. They directly recognize and attack infected or abnormal cells, leading to their destruction. This process is crucial in controlling viral infections and cancer cells.
Incorrect choices:
a. B cells, not T cells, are responsible for the production of antibodies during the humoral immune response.
c. Phagocytosis of pathogens is mainly carried out by macrophages and neutrophils, not T cells.
d. Allergic reactions are primarily mediated by a different type of T cells called helper T cells (CD4+ T cells), not cytotoxic T cells.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Explanation: Vaccinations are made from either weakened or killed pathogens or parts of pathogens, which cannot cause the disease they are meant to protect against. However, they stimulate the body's immune system to produce a protective response, providing immunity against the specific disease.
Correct Answer is C
Explanation
Explanation: The immune system is a complex network of cells, tissues, and organs that work together to identify and respond to foreign substances in the body, including bacteria, viruses, parasites, and toxins. Its primary function is to protect the body from infections and other harmful substances.
Incorrect choices:
a. The regulation of body temperature and blood pressure is primarily controlled by the nervous and endocrine systems, not the immune system.
b. Digestion and absorption of nutrients from food are processes mainly controlled by the digestive system, not the immune system.
d. The production of hormones that control bodily functions is primarily the responsibility of the endocrine system, not the immune system.
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