The secondary immune response is characterized by:
A delayed and weaker response compared to the primary immune response.
The activation of naive B cells and T cells.
A rapid and robust response due to the presence of memory cells.
The production of IgM antibodies.
The Correct Answer is C
Explanation: The secondary immune response is faster and more potent than the primary immune response due to the presence of memory B cells and memory T cells. These memory cells "remember" the specific antigen from a previous encounter, allowing for a quicker and more effective immune response upon re-exposure to the same antigen.
Incorrect choices:
a. The secondary immune response is faster and stronger compared to the primary immune response, not delayed and weaker.
b. The secondary immune response involves the activation of memory B cells and memory T cells, not naive B cells and T cells.
d. The primary immune response is characterized by the production of IgM antibodies initially, but during the secondary immune response, the production of IgG antibodies predominates, which are more effective in neutralizing antigens.
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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: Antigen recognition during the immune response occurs when antigens bind to specific receptors on immune cells, such as B cell receptors, T cell receptors, or antibodies. This binding is a critical step that triggers the activation of the immune response against the invading pathogen or foreign substance.
Incorrect choices:
a. Activation of regulatory T cells is important for controlling and regulating the immune response but is not directly related to the antigen recognition process.
b. Production of histamines by mast cells is involved in the inflammatory response, but it is not a direct step in the antigen recognition process.
d. Neutrophils are a type of white blood cell involved in the innate immune response. They do not release antibodies, as that function is primarily carried out by B cells and plasma cells.
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