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

Inhalation occurs when the:

diaphragm contracts and moves downward, increasing thoracic volume

intercostal muscles relax, causing the rib cage to move downward

diaphragm relaxes and moves upward, decreasing thoracic volume

pressure inside the lungs increases above atmospheric pressure

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Verified step by step guidance

Understand the mechanics of inhalation: Inhalation is the process of drawing air into the lungs, which requires an increase in thoracic volume and a decrease in pressure inside the lungs relative to atmospheric pressure.

Identify the role of the diaphragm: During inhalation, the diaphragm contracts and moves downward, which increases the vertical dimension of the thoracic cavity and contributes to the increase in thoracic volume.

Examine the role of intercostal muscles: The external intercostal muscles contract during inhalation, causing the rib cage to move upward and outward, further increasing thoracic volume.

Relate thoracic volume to pressure changes: According to Boyle's Law, an increase in thoracic volume leads to a decrease in pressure inside the lungs (intrapulmonary pressure), making it lower than atmospheric pressure and allowing air to flow into the lungs.

Eliminate incorrect options: Review the provided choices and eliminate options that describe relaxation of the diaphragm or intercostal muscles, as these actions are associated with exhalation rather than inhalation.