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

How does a capsule help certain bacteria evade detection by the immune system?

By preventing phagocytosis by immune cells

By enhancing the bacteria's motility

By producing toxins that kill immune cells

By increasing the bacteria's metabolic rate

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Verified step by step guidance

Understand the role of a bacterial capsule: A capsule is a protective layer that surrounds some bacteria, composed mainly of polysaccharides. It serves as a defense mechanism against the host's immune system.

Explore the concept of phagocytosis: Phagocytosis is a process where immune cells, such as macrophages and neutrophils, engulf and digest foreign particles, including bacteria. The capsule can interfere with this process.

Analyze how the capsule prevents phagocytosis: The capsule can make it difficult for immune cells to recognize and attach to the bacteria, thereby preventing phagocytosis. This allows the bacteria to evade detection and destruction by the immune system.

Consider other options: While enhancing motility, producing toxins, or increasing metabolic rate can aid bacterial survival, they are not directly related to the function of the capsule in evading immune detection.

Conclude with the correct mechanism: The primary function of the capsule in evading the immune system is by preventing phagocytosis, which is the most direct way it helps bacteria avoid detection and destruction by immune cells.