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

What is the primary function of cytotoxic T-cells in the immune system?

To directly kill infected host cells

To produce antibodies against pathogens

To activate B-cells to produce antibodies

To suppress the immune response to prevent autoimmunity

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Verified step by step guidance

Understand the role of cytotoxic T-cells: Cytotoxic T-cells, also known as CD8+ T-cells, are a type of lymphocyte that play a crucial role in the immune system by directly attacking and destroying infected cells.

Identify the mechanism of action: Cytotoxic T-cells recognize infected cells through the presentation of foreign antigens on the surface of these cells, typically via Major Histocompatibility Complex (MHC) class I molecules.

Explore the process of cell destruction: Once a cytotoxic T-cell recognizes an infected cell, it releases perforin and granzymes. Perforin forms pores in the target cell membrane, allowing granzymes to enter and induce apoptosis (programmed cell death).

Differentiate from other immune functions: Unlike B-cells, which produce antibodies, cytotoxic T-cells do not produce antibodies. Their primary function is direct cell-mediated destruction of infected cells.

Clarify the role in immune regulation: Cytotoxic T-cells are not primarily involved in activating B-cells or suppressing the immune response. Their main function is to eliminate cells that have been compromised by pathogens, such as viruses.