Table of contents

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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 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

22. The Respiratory System

Introduction to Lung Physiology

Anatomy & Physiology

22. The Respiratory System

Introduction to Lung Physiology

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Multiple Choice

What structure reduces friction around the lungs as they expand and contract?

Diaphragmatic muscle

Bronchial mucus

Pleural fluid

Alveolar sacs

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Verified step by step guidance

Understand the function of the pleural fluid: It acts as a lubricant to reduce friction between the surfaces of the pleura during breathing.

Identify the location of the pleural fluid: It is found in the pleural cavity, which is the space between the visceral and parietal pleura surrounding the lungs.

Recognize the role of the pleura: The pleura are two thin layers of tissue that protect and cushion the lungs.

Consider the mechanics of breathing: As the lungs expand and contract during inhalation and exhalation, the pleural fluid allows the pleura to slide smoothly over each other.

Differentiate from other structures: Understand that diaphragmatic muscle, bronchial mucus, and alveolar sacs have different functions and do not primarily serve to reduce friction around the lungs.