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 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 the Immune System

Anatomy & Physiology

21. The Immune System

Introduction to the Immune System

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Multiple Choice

Which of the following cells is responsible for destroying virus-infected cells?

Cytotoxic T cells

Macrophages

B cells

Helper T cells

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Verified step by step guidance

Understand the role of each cell type mentioned in the problem. Cytotoxic T cells, macrophages, B cells, and helper T cells each have distinct functions in the immune system.

Cytotoxic T cells are a type of lymphocyte that directly attack and destroy virus-infected cells. They recognize infected cells by detecting viral antigens presented on the surface of these cells.

Macrophages are large phagocytic cells that engulf and digest pathogens and debris. They are part of the innate immune system and do not specifically target virus-infected cells.

B cells are responsible for producing antibodies that bind to antigens, marking pathogens for destruction by other immune cells. They do not directly destroy virus-infected cells.

Helper T cells assist other cells in the immune response by releasing cytokines that stimulate the activity of B cells and cytotoxic T cells. They do not directly destroy virus-infected cells.