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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

Lysozyme is effective at destroying bacteria pathogens because it does what?

Waterproofs skin.

Disrupts the bacterial cell membrane.

Hydrolyzes peptidoglycan cell walls.

Propels the cilia of the gastrointestinal tract.

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Understand the role of lysozyme: Lysozyme is an enzyme that plays a crucial role in the immune system by targeting bacteria.

Identify the structure targeted by lysozyme: Lysozyme specifically targets the peptidoglycan layer in bacterial cell walls.

Explain the mechanism of action: Lysozyme hydrolyzes the bonds between N-acetylmuramic acid and N-acetylglucosamine in peptidoglycan, weakening the cell wall.

Consider the consequences of this action: By breaking down the peptidoglycan, lysozyme compromises the structural integrity of the bacterial cell wall, leading to cell lysis.

Clarify why other options are incorrect: Lysozyme does not waterproof skin, disrupt cell membranes, or propel cilia; its primary function is to hydrolyze peptidoglycan cell walls.