Memory B cells are responsible for:
The production of antibodies during the primary immune response.
The activation of helper T cells.
Initiating the complement cascade.
Mounting a rapid and robust response during the secondary immune response.
The Correct Answer is D
xplanation: Memory B cells are formed during the primary immune response and play a critical role in the secondary immune response. When re-exposed to the same antigen, memory B cells quickly differentiate into plasma cells that produce large quantities of specific antibodies, leading to a rapid and robust immune response.
Incorrect choices:
a. The production of antibodies during the primary immune response is primarily carried out by plasma cells, not memory B cells.
b. The activation of helper T cells is essential for coordinating the immune response, but memory B cells are not directly responsible for this process.
c. The initiation of the complement cascade is a separate component of the immune response involving complement proteins, and memory B cells are not directly involved in this process.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Explanation: Booster doses of vaccines are recommended to reinforce and extend the duration of immunity provided by the initial vaccination. They help the immune system to maintain a higher level of protection against the disease over time.
Incorrect choices:
a. The number of antibodies in the blood is not increased by booster doses; rather, the immune system's memory is reinforced.
b. Booster doses do not decrease the risk of adverse reactions; they are given to maintain immunity.
d. Booster doses do not reduce the number of required vaccine doses; they are additional doses given to maintain immunity over time.
Correct Answer is C
Explanation
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.
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