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 C
Explanation
Explanation: Receiving antibodies through placenta during pregnancy. Passive immunity is acquired when preformed antibodies are transferred from one individual to another, providing immediate but temporary protection. This can occur naturally through breastfeeding or artificially through administration of preformed antibodies, as in the case of placental transfer of antibodies from a mother to her baby.
Incorrect choices:
a. Receiving a flu vaccine involves active immunity, where the body is exposed to an attenuated or inactivated pathogen to stimulate the production of antibodies and memory cells for long-term protection.
b. Developing immunity after recovering from a viral infection is an example of active immunity, where the body mounts an immune response and produces memory cells to provide long-lasting protection against the pathogen.
d. Producing memory cells after exposure to a pathogen is part of the adaptive immune response and contributes to long-term immunity, not passive immunity.
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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