Table of contents

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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 Heart2h 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 T Lymphocytes

Anatomy & Physiology

21. The Immune System

Introduction to T Lymphocytes

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Multiple Choice

Which of the following is NOT a component of TCRs?

Alpha chain.

CD3 complex.

Beta chain.

Constant & Variable Regions.

None of the above.

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Understand the structure of T-cell receptors (TCRs), which are crucial for the immune response. TCRs are composed of two different polypeptide chains, typically an alpha and a beta chain.

Recognize that each TCR chain has both constant and variable regions. The variable region is responsible for antigen recognition, while the constant region provides structural support.

Identify the role of the CD3 complex, which is not a part of the TCR itself but is associated with it. The CD3 complex is essential for signal transduction once the TCR binds to an antigen.

Evaluate the options given: Alpha chain, Beta chain, Constant & Variable Regions, and CD3 complex. Determine which of these is not a structural component of the TCR.

Conclude that the CD3 complex, while associated with TCRs, is not a component of the TCR structure itself, making it the correct answer to the question.