Table of contents

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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 Heart2h 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

Classes of Antibodies

Anatomy & Physiology

21. The Immune System

Classes of Antibodies

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Multiple Choice

Cytotoxic T cells kill target cells __________.

by releasing oxidizing agents

by secreting antibodies

through insertion of perforins into the target's membrane

by phagocytosis

through injection of tumor necrosis factor

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Verified step by step guidance

Understand the role of cytotoxic T cells in the immune system. They are a type of lymphocyte that plays a crucial role in the adaptive immune response by directly killing infected or cancerous cells.

Recognize that cytotoxic T cells do not kill target cells by releasing oxidizing agents or secreting antibodies. These methods are not typical functions of cytotoxic T cells.

Identify that phagocytosis is a process used by other immune cells, such as macrophages, to engulf and digest pathogens, not a method used by cytotoxic T cells.

Learn that cytotoxic T cells kill target cells primarily through the insertion of perforins into the target's membrane. Perforins create pores in the membrane, leading to cell lysis and death.

Understand that while tumor necrosis factor (TNF) can be involved in cell death, the primary mechanism for cytotoxic T cells is the use of perforins to disrupt the target cell's membrane.