Textbook Question
Cells that can directly attack target cells include all of the following except:
a. Macrophages
b. Cytotoxic T cells
c. Helper T cells
d. Natural killer cells
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21. The Immune System
Classes of Antibodies
Multiple Choice
Which immunoglobulin (Ig) is the most abundant of circulating antibodies?
A
IgA
B
IgE
C
IgG
D
IgM
Verified step by step guidance1
Understand the role of immunoglobulins (Ig) in the immune system: Immunoglobulins, also known as antibodies, are proteins produced by plasma cells that help the immune system identify and neutralize foreign objects like bacteria and viruses.
Identify the different types of immunoglobulins: There are five main classes of immunoglobulins in humans - IgA, IgD, IgE, IgG, and IgM, each with distinct roles and locations in the body.
Focus on the function and abundance of each immunoglobulin: IgA is found in mucous membranes, IgE is involved in allergic reactions, IgG is the most common and provides the majority of antibody-based immunity, and IgM is the first antibody produced in response to an infection.
Recognize that IgG is the most abundant immunoglobulin in circulation: IgG makes up about 75-80% of the antibodies in the blood and is crucial for long-term protection against pathogens.
Conclude that IgG is the correct answer: Based on its abundance and role in the immune system, IgG is the most abundant of circulating antibodies.
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