Which of the following statements about the secondary immune response is correct?
It is primarily mediated by IgM antibodies.
It occurs after the primary immune response and is slower.
Memory cells are not involved in the secondary immune response.
It provides long-lasting immunity due to the presence of memory cells.
The Correct Answer is D
Explanation: The secondary immune response provides long-lasting immunity because of the presence of memory B cells and memory T cells. These memory cells "remember" the specific antigen and can quickly mount a strong and effective immune response upon re-exposure to the same antigen, providing long-term protection.
Incorrect choices:
a. The primary immune response is primarily mediated by IgM antibodies, while the secondary immune response involves the predominance of IgG antibodies, which are more effective and provide long-lasting immunity.
b. The secondary immune response occurs after the primary immune response and is faster, not slower, due to the presence of memory cells.
c. Memory cells are a key component of the secondary immune response, playing a central role in providing rapid and robust immunity.
VI. Immune Disorders and Clinical Considerations:
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Related Questions
Correct Answer is D
Explanation
Explanation: Recognizing and responding to specific antigens. T cells are a type of lymphocyte that plays a central role in cell-mediated immunity. They recognize and respond to specific antigens presented by infected or abnormal cells, leading to their destruction.
Incorrect choices:
a. T cells are not responsible for the production of antibodies, but that is the role of B cells in the humoral immune response.
b. While T cells are involved in directly attacking and destroying infected cells, their main function is to recognize specific antigens rather than directly attacking pathogens.
c. Marking pathogens for destruction by phagocytes is primarily a function of antibodies and complement proteins, not T cells.
Correct Answer is C
Explanation
Explanation:Innate immunity. Innate immunity is the body's first line of defense and provides immediate protection against infections without prior exposure to the pathogen. It includes physical barriers, such as the skin, and various cellular and chemical components.
Incorrect choices:
a. Adaptive immunity is the acquired immunity that develops after exposure to a specific pathogen or vaccination. It takes some time to mount a response and produce antibodies or memory cells.
b. Humoral immunity is a component of adaptive immunity that involves the production of antibodies by B cells to neutralize pathogens.
d. Cell-mediated immunity is another component of adaptive immunity, where T cells directly attack infected or abnormal cells.
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