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 microbial virulence factor is most important for attachment to host respiratory tissues?

Capsules

Endotoxins

Pili

Flagella

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Verified step by step guidance

Understand the role of microbial virulence factors: Virulence factors are molecules produced by pathogens that contribute to the pathogenicity and enable them to colonize the host, evade the immune system, and obtain nutrients from the host.

Identify the function of each virulence factor: Capsules help in evading the immune response, endotoxins are toxins released by bacteria, flagella are used for motility, and pili are hair-like structures that facilitate attachment to host cells.

Focus on the attachment process: For a microbe to establish an infection, it must first attach to host tissues. This is often achieved through specific structures that can adhere to host cells.

Recognize the role of pili: Pili, also known as fimbriae, are primarily involved in the attachment of bacteria to host cells. They are crucial for the initial colonization of host tissues, particularly in the respiratory tract.

Conclude that pili are the most important virulence factor for attachment to host respiratory tissues, as they directly facilitate the adherence of bacteria to the epithelial cells lining the respiratory tract.