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

Which of the following occurs during inhalation?

The pressure inside the lungs increases above atmospheric pressure.

The diaphragm relaxes and moves upward.

The intercostal muscles relax, decreasing thoracic volume.

The diaphragm contracts and moves downward.

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Verified step by step guidance

Understand the process of inhalation: Inhalation is the process of drawing air into the lungs, which involves changes in pressure and volume within the thoracic cavity.

Identify the role of the diaphragm: During inhalation, the diaphragm, a dome-shaped muscle located at the base of the lungs, plays a crucial role by contracting and moving downward.

Recognize the effect on thoracic volume: As the diaphragm contracts and moves downward, the volume of the thoracic cavity increases, creating a negative pressure relative to the atmospheric pressure.

Consider the role of intercostal muscles: The external intercostal muscles also contract during inhalation, lifting the ribs and further increasing the thoracic volume.

Conclude the pressure changes: The increase in thoracic volume leads to a decrease in pressure inside the lungs, allowing air to flow in from the higher atmospheric pressure outside.