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 is NOT a step used by cytotoxic T cells to kill infected host cells?

Secretion of granzymes to induce apoptosis in the target cell

Recognition of antigen presented by MHC class I molecules

Phagocytosis of the target cell

Release of perforin to create pores in the target cell membrane

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Verified step by step guidance

Understand the role of cytotoxic T cells: Cytotoxic T cells are a type of immune cell that play a crucial role in the body's defense against infected or cancerous cells. They are part of the adaptive immune system and are specifically designed to target and destroy cells that display foreign antigens.

Identify the mechanism of action: Cytotoxic T cells kill infected host cells through a series of steps that involve recognition and destruction. They recognize infected cells by detecting antigens presented by MHC class I molecules on the surface of these cells.

Examine the process of apoptosis induction: Once the cytotoxic T cell recognizes the infected cell, it releases granzymes, which are serine proteases that enter the target cell and induce apoptosis, a programmed cell death process.

Explore the role of perforin: Cytotoxic T cells also release perforin, a protein that forms pores in the target cell's membrane. This pore formation facilitates the entry of granzymes into the target cell, leading to apoptosis.

Clarify the incorrect step: Phagocytosis is not a mechanism used by cytotoxic T cells to kill infected host cells. Phagocytosis is a process used by other immune cells, such as macrophages, to engulf and digest pathogens or debris, not a direct killing method employed by cytotoxic T cells.