Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

21. The Immune System

Classes of Antibodies

Anatomy & Physiology

21. The Immune System

Classes of Antibodies

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Multiple Choice

Which immunoglobulin (Ig) is the most abundant of circulating antibodies?

IgA

IgE

IgG

IgM

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Verified step by step guidance

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.