During cell-mediated immunity, T cells recognize antigens presented by:
Macrophages
B cells
Plasma cells
Memory cells
The Correct Answer is A
Explanation: During cell-mediated immunity, T cells recognize antigens that are presented by antigen-presenting cells (APCs) such as macrophages. Macrophages engulf and process pathogens, and then they display fragments of the pathogens' antigens on their cell surface using major histocompatibility complex (MHC) molecules. T cells, specifically helper T cells, interact with these antigen-presenting macrophages and become activated to initiate immune responses.
Incorrect choices:
b. B cells present antigens to helper T cells during the humoral immune response, not during cell-mediated immunity.
c. Plasma cells are not involved in antigen presentation; they are terminally differentiated B cells that produce antibodies during the humoral immune response.
d. Memory cells are formed after the immune system encounters an antigen and are not directly involved in antigen presentation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Explanation: Healthcare workers are recommended to receive the hepatitis B vaccine to protect against hepatitis B virus (HBV) infection, which can be transmitted through contact with infected blood or body fluids.
Incorrect choices:
a. The influenza vaccine is recommended annually for healthcare workers to protect against seasonal flu, not hepatitis B.
b. The tetanus toxoid vaccine protects against tetanus, not hepatitis B.
d. The pneumococcal polysaccharide vaccine protects against pneumonia caused by Streptococcus pneumoniae bacteria, not hepatitis B.
Correct Answer is A
Explanation
Explanation: Todirectly destroy pathogens and infected cells. Antibodies are Y-shaped proteins produced by B cells in response to a specific pathogen. They bind to the surface of the pathogen and mark it for destruction by other components of the immune system or directly neutralize the pathogen.
Incorrect choices:
b. While antibodies can attract white blood cells to the site of infection, their primary role is not to do so but rather to directly target and neutralize pathogens.
c. Antibodies do not produce hormones but are part of the humoral immune response, which involves the production of antibodies to fight off infections.
d. Antibodies do not play a role in maintaining body temperature during infections; instead, fever is a response triggered by the release of certain chemicals called pyrogens during infections.
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