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 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

First-Line Defenses: Chemical Barriers

Anatomy & Physiology

21. The Immune System

First-Line Defenses: Chemical Barriers

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Multiple Choice

Which nonspecific defense cells specialize in attacking cancer cells and virus-infected cells?

macrophages

basophils

helper T lymphocytes

plasma cells

natural killer cells

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Verified step by step guidance

Understand the role of nonspecific defense cells in the immune system. These cells are part of the innate immune response, which provides a general defense against pathogens and does not require prior exposure to a specific pathogen.

Identify the types of cells listed in the problem: macrophages, basophils, helper T lymphocytes, plasma cells, and natural killer cells. Each of these cells has a specific function in the immune system.

Macrophages are phagocytic cells that engulf and digest pathogens and cellular debris. They are part of the nonspecific defense but do not specialize in attacking cancer or virus-infected cells.

Basophils are involved in inflammatory responses and allergic reactions. They release histamine and other chemicals but do not directly attack cancer or virus-infected cells.

Natural killer (NK) cells are a type of lymphocyte that can recognize and destroy cancer cells and virus-infected cells without prior sensitization. They are part of the innate immune system and specialize in this function, making them the correct answer.