Multiple Choice
Which part of an antibody recognizes and binds to antigens?
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21. The Immune System
Classes of Antibodies
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In humans, what is the approximate half-life of IgA in the blood?
A
About 6 days
B
About 2 days
C
About 21 days
D
About 5 hours
Verified step by step guidance1
Understand that the half-life of an immunoglobulin (antibody) refers to the time it takes for its concentration in the blood to reduce by half due to natural degradation and clearance.
Recall that different classes of immunoglobulins (IgG, IgA, IgM, etc.) have distinct half-lives based on their structure and function in the immune system.
Identify that IgA is primarily found in mucosal areas and also circulates in the blood, and its half-life is shorter than that of IgG but longer than some other immunoglobulins.
Use known physiological data or reference materials that state the approximate half-life of IgA in human blood, which is about 6 days.
Compare this value with the other options (2 days, 21 days, 5 hours) to confirm that about 6 days is the most accurate estimate for IgA's half-life in blood.
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