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

Which of the following is true about inspiration in lung physiology?

The diaphragm contracts and moves downward, increasing thoracic volume.

The external intercostal muscles relax, reducing thoracic volume.

Intrapulmonary pressure increases above atmospheric pressure.

The diaphragm relaxes and moves upward, decreasing thoracic volume.

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Verified step by step guidance

Understand the process of inspiration: Inspiration is the phase of breathing where air is drawn into the lungs. It involves the contraction of certain muscles to increase the volume of the thoracic cavity.

Identify the role of the diaphragm: During inspiration, the diaphragm contracts and moves downward. This movement increases the vertical dimension of the thoracic cavity, thereby increasing its volume.

Consider the role of the external intercostal muscles: These muscles contract during inspiration, lifting the ribs and expanding the chest cavity further, which also contributes to the increase in thoracic volume.

Analyze intrapulmonary pressure changes: As the thoracic volume increases, the pressure inside the lungs (intrapulmonary pressure) decreases below atmospheric pressure, allowing air to flow into the lungs.

Clarify the incorrect statements: The diaphragm relaxing and moving upward, and the external intercostal muscles relaxing, are actions associated with expiration, not inspiration. During inspiration, both the diaphragm and external intercostal muscles contract to increase thoracic volume.