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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

Why is normal exhalation considered a passive process in lung physiology?

Because it depends on the active transport of oxygen out of the lungs.

Because it relies on the contraction of the diaphragm and intercostal muscles.

Because it requires active contraction of the abdominal muscles.

Because it involves the relaxation of the diaphragm and elastic recoil of the lungs.

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Verified step by step guidance

Understand that normal exhalation is the process of expelling air from the lungs after inhalation.

Recognize that during inhalation, the diaphragm and intercostal muscles contract, increasing the volume of the thoracic cavity and decreasing the pressure inside the lungs, allowing air to flow in.

During exhalation, these muscles relax, which decreases the volume of the thoracic cavity and increases the pressure inside the lungs, pushing air out.

The elastic recoil of the lungs refers to the natural tendency of the lung tissue to return to its original size after being stretched during inhalation.

Since exhalation primarily involves the relaxation of muscles and the passive elastic recoil of lung tissues, it is considered a passive process, as it does not require active muscle contraction.