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:
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Explanation: Immune disorders can result from either an overactive immune system (autoimmune disorders) or an underactive immune system (immunodeficiency disorders). In autoimmune disorders, the immune system attacks the body's own tissues, while in immunodeficiency disorders, the immune system is weakened, making the individual more susceptible to infections.
Correct Answer is C
Explanation
Correct answer: C
A.B cells are part of the adaptive immune system and are responsible for antibody-mediated immunity. They do not directly attack and kill infected cells. Instead, B cells produce antibodies that can recognize and neutralize pathogens or foreign substances.
b. B cells are involved in antibody-mediated immunity, not cell-mediated immunity. They produce antibodies that circulate in the bloodstream and bind to antigens on pathogens, marking them for destruction by other immune cells.
c. B cells are crucial for recognizing "foreign" molecules (antigens) on pathogens and producing antibodies that can bind to those antigens. Macrophages engulf pathogens and present fragments (antigens) of them on their surface, allowing B cells to identify and target the specific pathogen.
d. Phagocytosis of pathogens is mainly carried out by macrophages and neutrophils, not B cells.
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