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 class of immunoglobulins is most abundant in the human body?

IgE

IgA

IgG

IgM

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Verified step by step guidance

Understand the role of immunoglobulins: Immunoglobulins, or antibodies, are proteins produced by the immune system to identify and neutralize foreign objects like bacteria and viruses.

Identify the different classes of immunoglobulins: The main classes are IgG, IgA, IgM, IgE, and IgD, each with distinct roles and properties in the immune response.

Recognize the abundance of each class: IgG is the most abundant immunoglobulin in the human body, making up about 75-80% of the antibodies in blood and extracellular fluid.

Consider the functions of IgG: It plays a crucial role in the body's defense against bacterial and viral infections, and it is the only antibody that can cross the placenta to provide passive immunity to the fetus.

Compare with other immunoglobulins: While IgA is abundant in mucosal areas and IgM is the first antibody produced in response to an infection, neither is as prevalent in the bloodstream as IgG.