Final answer:
The first antibodies produced by plasma cells are IgM, which play a critical role in the initial immune response. IgM is effective in agglutinating pathogens and activating the complement system. Therefore, the correct answer is c) IgM.
Explanation:
Understanding Antibody Production
In the immune response, plasma cells are crucial for fighting infections as they are responsible for producing antibodies. The first type of antibody produced in response to an antigen is IgM. This is typically followed by the production of other classes of antibodies, but IgM is the first to appear because it can agglutinate pathogens effectively and activate the complement system, enhancing the immune response.
Here’s a brief overview of the different antibody classes:
- IgM: The first antibody produced in response to an infection.
- IgG: The most abundant antibody in circulation, involved in long-term immunity.
- IgA: Found in mucosal areas, such as the gut and respiratory tract.
- IgE: Associated with allergic reactions and responses to parasites.
- IgD: Function is not well understood, but it is present on the surface of B cells.
Conclusion
Thus, the correct answer is IgM (option c), as it is the first antibody produced by plasma cells.
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