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

What happens when the diaphragm contracts during inhalation?

The thoracic cavity increases in volume, causing air to be drawn into the lungs.

The thoracic cavity decreases in volume, causing air to be expelled from the lungs.

The diaphragm moves upward, reducing lung capacity.

The diaphragm remains stationary, maintaining constant lung pressure.

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Verified step by step guidance

Understand the role of the diaphragm in respiration: The diaphragm is a dome-shaped muscle located at the base of the thoracic cavity. It plays a crucial role in the process of breathing by changing the volume of the thoracic cavity.

Identify the action of the diaphragm during inhalation: During inhalation, the diaphragm contracts and moves downward, flattening out. This movement increases the volume of the thoracic cavity.

Explain the effect of increased thoracic cavity volume: As the volume of the thoracic cavity increases, the pressure inside the cavity decreases according to Boyle's Law, which states that pressure and volume are inversely related.

Describe the result of decreased pressure in the thoracic cavity: The decrease in pressure inside the thoracic cavity creates a pressure gradient between the outside air and the air inside the lungs, causing air to be drawn into the lungs.

Summarize the process: The contraction of the diaphragm during inhalation increases the thoracic cavity's volume, decreases internal pressure, and results in air being drawn into the lungs, facilitating breathing.