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

22. The Respiratory System

Introduction to Lung Physiology

Anatomy & Physiology

22. The Respiratory System

Introduction to Lung Physiology

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Multiple Choice

Air rushes into the lungs of humans during inhalation because:

the diaphragm relaxes and pushes air into the lungs

the pressure inside the lungs is higher than the atmospheric pressure

oxygen is actively transported into the lungs

the pressure inside the lungs is lower than the atmospheric pressure

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Verified step by step guidance

Understand the mechanics of breathing: During inhalation, the diaphragm contracts and moves downward, increasing the volume of the thoracic cavity. This creates a pressure gradient between the lungs and the atmosphere.

Apply Boyle's Law: Boyle's Law states that pressure and volume are inversely related. As the thoracic cavity's volume increases, the pressure inside the lungs decreases.

Compare pressures: Atmospheric pressure outside the body remains constant, while the pressure inside the lungs decreases due to the increased volume. This creates a pressure difference.

Explain air movement: Air moves from areas of higher pressure (atmosphere) to areas of lower pressure (lungs) to equalize the pressure gradient. This is why air rushes into the lungs during inhalation.

Clarify the correct answer: The correct answer is that the pressure inside the lungs is lower than the atmospheric pressure, which drives air into the lungs during inhalation.