Which type of T cell is responsible for enhancing the activity of other immune cells during the immune response?
Cytotoxic T cells
Memory T cells
Helper T cells
Suppressor T cells
The Correct Answer is C
Explanation: Helper T cells (CD4+ T cells) play a critical role in the immune response by enhancing the activity of other immune cells. They secrete cytokines that stimulate B cells to produce antibodies, activate cytotoxic T cells to kill infected cells, and promote the function of macrophages in phagocytosis. Helper T cells are essential for coordinating and regulating the immune response.
Incorrect choices:
a. Cytotoxic T cells (CD8+ T cells) are responsible for directly attacking and killing infected cells, not enhancing the activity of other immune cells.
b. Memory T cells are formed after the immune system encounters an antigen and are not directly involved in enhancing immune cell activity.
d. Suppressor T cells (regulatory T cells) are involved in down-regulating the immune response to prevent excessive inflammation and tissue damage, not in enhancing immune cell activity.
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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 D
Explanation
Explanation: The immune response is a complex system of defense mechanisms that aim to protect the body from pathogens, such as bacteria, viruses, and other foreign substances. It involves the activation of various immune cells, production of antibodies, and other immune components to recognize and eliminate the invading pathogens.
Incorrect choices:
a. Directly attacking and killing infected cells is the role of cytotoxic T cells during cell-mediated immunity, but it is not the primary purpose of the overall immune response.
b. Antigens are foreign substances that trigger the immune response. They are not produced by the immune response itself but rather recognized by immune cells and antibodies.
c. The immune response is not involved in regulating the body's metabolism. Metabolism regulation is primarily controlled by other systems in the body, such as the endocrine system.
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