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The first antibody to appear in the ser...

The first antibody to appear in the serum following stimulation by antigen is

A

IgM

B

IgG and mast cells

C

IgA

D

IgD

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Antibodies**: Antibodies are proteins produced by the immune system to identify and neutralize foreign objects like bacteria and viruses. They are crucial for the immune response. 2. **Antigen Stimulation**: When an antigen (a substance that triggers an immune response) enters the body, it stimulates the immune system to produce antibodies. 3. **B Cells Activation**: The primary immune response involves the activation of B cells. These cells are responsible for producing antibodies. 4. **First Antibody Produced**: Upon activation, B cells begin to produce antibodies. The first type of antibody that is produced in response to an antigen is known as IgM (Immunoglobulin M). 5. **Characteristics of IgM**: IgM is the first antibody to appear in the serum following stimulation by an antigen. It is also the major class of antibody secreted into the blood during the initial immune response. 6. **Conclusion**: Therefore, the first antibody to appear in the serum following stimulation by an antigen is IgM. **Final Answer**: IgM ---
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