Multiple choice

An antibody is a protein produced by the body's immune system against antigens.The largest antibody in the human circulatory system is

  1. Immunoglobulin A

  2. Immunoglobulin D

  3. Immunoglobulin E

  4. Immunoglobulin M
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Immunoglobulin M is a basic antibody that is produced by B cells. It is the primary antibody against A and B antigens on red blood cells. IgM is by far  physically the largest antibody in the human circulatory system. It is the first antibody to appear in response to initial exposure to antigen.

Keep practicing — related questions