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

Major Histocompatibility Complex Molecules

Anatomy & Physiology

21. The Immune System

Major Histocompatibility Complex Molecules

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Multiple Choice

Which class of MHC proteins presents exogenous antigens?

MHC Class IV

MHC Class III

MHC Class II

MHC Class I

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Verified step by step guidance

Understand the role of Major Histocompatibility Complex (MHC) proteins in the immune system. MHC proteins are crucial for the presentation of antigens to T cells, which is a key step in the immune response.

Differentiate between the classes of MHC proteins. MHC Class I proteins present endogenous antigens, typically from within the cell, to CD8+ T cells. These are usually antigens from viruses or intracellular pathogens.

Learn about MHC Class II proteins. These proteins present exogenous antigens, which are antigens that originate outside the cell, to CD4+ T helper cells. This process is essential for initiating the immune response against extracellular pathogens.

Recognize that MHC Class III proteins are not involved in antigen presentation. Instead, they are associated with other immune functions, such as the production of certain components of the complement system.

Conclude that MHC Class II proteins are responsible for presenting exogenous antigens, as they are specifically designed to interact with CD4+ T helper cells to facilitate the immune response against pathogens that are outside the cells.