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 T Lymphocytes

Anatomy & Physiology

21. The Immune System

Introduction to T Lymphocytes

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Multiple Choice

Which of the following cells recognizes antigens displayed on host cells with MHC II molecules?

B cells

Cytotoxic T cells

Helper T cells

Natural killer cells

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Verified step by step guidance

Understand the role of MHC II molecules: MHC II molecules are found on the surface of certain immune cells, such as macrophages, dendritic cells, and B cells. They present processed antigens to T cells.

Identify the type of T cell that interacts with MHC II: Helper T cells (CD4+ T cells) are the ones that recognize antigens presented by MHC II molecules.

Differentiate between T cell types: Cytotoxic T cells (CD8+ T cells) recognize antigens presented by MHC I molecules, not MHC II. Natural killer cells do not rely on MHC molecules for antigen recognition.

Recognize the function of Helper T cells: Once a Helper T cell recognizes an antigen-MHC II complex, it becomes activated and helps stimulate other immune cells, such as B cells and cytotoxic T cells, to mount an immune response.

Conclude that Helper T cells are the correct answer: Based on their role in recognizing antigens presented by MHC II molecules, Helper T cells are the cells that fulfill this function.