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 Cells of the Immune System

Anatomy & Physiology

21. The Immune System

Introduction to Cells of the Immune System

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Multiple Choice

How do cytotoxic T lymphocytes directly attack target cells?

By releasing perforin and granzymes to induce apoptosis

By phagocytizing the target cells

By activating B cells to produce antibodies

By producing antibodies that neutralize pathogens

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Verified step by step guidance

Understand the role of cytotoxic T lymphocytes (CTLs) in the immune system. CTLs are a type of white blood cell that play a crucial role in the adaptive immune response by directly attacking and destroying infected or cancerous cells.

Recognize that CTLs do not phagocytize target cells. Phagocytosis is a process typically carried out by other immune cells like macrophages and neutrophils.

Identify that CTLs do not produce antibodies. Antibody production is primarily the function of B cells, which are another type of lymphocyte.

Learn that CTLs release specific proteins called perforin and granzymes. Perforin forms pores in the target cell's membrane, allowing granzymes to enter the cell.

Understand that once inside the target cell, granzymes trigger apoptosis, a programmed cell death process, effectively eliminating the infected or cancerous cell.