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 of the following statements is true regarding the interaction between CD40 and CD40 ligand?

CD40 ligand is primarily expressed on B cells and interacts with CD40 on T cells.

CD40 ligand is a soluble protein that circulates freely in the bloodstream.

The interaction between CD40 and CD40 ligand is crucial for B cell activation and antibody production.

CD40 is a cytokine that binds to CD40 ligand to initiate apoptosis in immune cells.

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Verified step by step guidance

Understand the roles of CD40 and CD40 ligand in the immune system. CD40 is a receptor found on the surface of B cells, while CD40 ligand (also known as CD40L or CD154) is primarily expressed on activated T cells.

Recognize the importance of the interaction between CD40 and CD40 ligand. This interaction is crucial for the activation of B cells, which leads to their proliferation and differentiation into plasma cells that produce antibodies.

Clarify the incorrect statements: CD40 ligand is not primarily expressed on B cells; it is expressed on T cells. CD40 ligand is not a soluble protein; it is a membrane-bound protein on T cells.

Identify the correct statement: The interaction between CD40 and CD40 ligand is essential for B cell activation and antibody production, which is a key process in the adaptive immune response.

Understand that CD40 is not a cytokine, and its interaction with CD40 ligand does not initiate apoptosis in immune cells. Instead, it promotes survival and activation of B cells.