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 the Immune System

Anatomy & Physiology

21. The Immune System

Introduction to the Immune System

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Multiple Choice

Which of the following is a component of the innate immune system that acts as a virulence factor?

Capsule

Interferon

Complement proteins

Lysozyme

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Verified step by step guidance

Begin by understanding the innate immune system, which is the body's first line of defense against pathogens. It includes physical barriers, chemical barriers, and various immune cells.

Identify the components listed in the problem: Capsule, Interferon, Complement proteins, and Lysozyme. Determine which of these are part of the innate immune system.

Consider the function of each component: Capsules are structures found in some bacteria that help them evade the immune system, acting as virulence factors. Interferons are proteins that help protect cells from viral infections. Complement proteins are part of the immune system that enhance the ability to clear microbes and damaged cells. Lysozyme is an enzyme that breaks down bacterial cell walls.

Evaluate which component acts as a virulence factor. A virulence factor is a molecule produced by pathogens that contribute to the pathogenicity of the organism. Capsules help bacteria avoid phagocytosis, making them a virulence factor.

Conclude that the capsule is the component of the innate immune system that acts as a virulence factor, as it helps bacteria evade the immune response.