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 would be targeted by cytotoxic T cells?

Healthy red blood cells

Bacteria in the bloodstream

Virus-infected cells

Extracellular pathogens

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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 immune cell that play a crucial role in the adaptive immune response. Their primary function is to identify and destroy infected or cancerous cells in the body.

Identify the target of cytotoxic T cells: Cytotoxic T cells specifically target cells that display abnormal or foreign antigens on their surface. These antigens are typically presented by Major Histocompatibility Complex (MHC) class I molecules, which are found on all nucleated cells.

Differentiate between the options: Healthy red blood cells do not present foreign antigens via MHC class I molecules, as they lack a nucleus. Bacteria in the bloodstream are extracellular pathogens and are typically targeted by antibodies and phagocytes, not cytotoxic T cells.

Focus on virus-infected cells: Virus-infected cells present viral antigens on their surface using MHC class I molecules. This makes them a primary target for cytotoxic T cells, which recognize and bind to these antigens, leading to the destruction of the infected cell.

Conclude with the correct target: Based on the understanding of cytotoxic T cells' function and the nature of the options provided, virus-infected cells are the correct target for cytotoxic T cells, as they present the necessary antigens for recognition and destruction.