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

Which of the following statements regarding natural killer (NK) cells is false or incorrect?

NK cells require prior sensitization to recognize and kill target cells.

NK cells are a type of lymphocyte involved in the innate immune response.

NK cells release perforin and granzymes to destroy target cells.

NK cells can induce apoptosis in virus-infected cells and tumor cells.

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Verified step by step guidance

Understand the role of natural killer (NK) cells in the immune system. NK cells are a type of lymphocyte that play a crucial role in the innate immune response, which is the body's first line of defense against infections and tumors.

Recognize that NK cells are unique because they do not require prior sensitization to recognize and kill target cells. This is a key feature that distinguishes them from other lymphocytes like T cells, which do require prior sensitization.

Learn about the mechanisms NK cells use to destroy target cells. They release cytotoxic molecules such as perforin and granzymes, which lead to the destruction of the target cell.

Understand that NK cells can induce apoptosis, a form of programmed cell death, in virus-infected cells and tumor cells. This is an important function in controlling infections and preventing cancer progression.

Identify the false statement by comparing it to the known characteristics of NK cells. The statement that NK cells require prior sensitization to recognize and kill target cells is incorrect, as NK cells are part of the innate immune system and do not need prior sensitization.