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 Innate Immunity

Anatomy & Physiology

21. The Immune System

Introduction to Innate Immunity

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Multiple Choice

Which of the following innate internal defenses works by interfering with viral replication?

Natural killer cells

Interferons

Complement proteins

Macrophages

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Verified step by step guidance

Begin by understanding the role of innate internal defenses in the immune system. These defenses are non-specific and act as the first line of defense against pathogens.

Identify the function of each option provided: Natural killer cells, Interferons, Complement proteins, and Macrophages.

Natural killer cells are a type of lymphocyte that can destroy infected or cancerous cells by inducing apoptosis, but they do not directly interfere with viral replication.

Complement proteins are part of the complement system, which enhances the ability of antibodies and phagocytic cells to clear microbes and damaged cells, but they do not directly interfere with viral replication.

Interferons are proteins released by host cells in response to the presence of pathogens such as viruses. They work by interfering with viral replication, making them the correct answer to the problem.