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

Introduction to the Immune System

Anatomy & Physiology

21. The Immune System

Introduction to the Immune System

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Multiple Choice

Which immunoglobulin is found on the surface of B lymphocytes and is important in B cell activation?

IgG

IgE

IgD

IgA

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Verified step by step guidance

Understand the role of B lymphocytes in the immune system: B lymphocytes (B cells) are responsible for producing antibodies and play a crucial role in adaptive immunity. They require activation to initiate antibody production.

Learn about immunoglobulins (antibodies): Immunoglobulins are proteins produced by B cells that help identify and neutralize pathogens. There are five main classes of immunoglobulins: IgG, IgA, IgM, IgE, and IgD, each with distinct functions.

Focus on IgD: IgD is a type of immunoglobulin found on the surface of immature B cells. It plays a critical role in B cell activation by acting as a receptor for antigens, which triggers the B cell to become activated and start producing antibodies.

Compare IgD with other immunoglobulins: IgG is the most abundant antibody in circulation and provides long-term immunity. IgA is found in mucosal areas and secretions like saliva and tears. IgE is involved in allergic responses. None of these are primarily involved in B cell activation like IgD.

Conclude that IgD is the correct answer: Based on its function as a receptor on B cells and its role in activation, IgD is the immunoglobulin associated with B cell activation.