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 does NOT occur during inspiration?

The thoracic cavity volume increases

Air flows into the lungs

The diaphragm relaxes

Intrapulmonary pressure decreases

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Verified step by step guidance

Step 1: Begin by understanding the process of inspiration (inhalation). During inspiration, the diaphragm contracts and moves downward, increasing the volume of the thoracic cavity. This is a key mechanism for drawing air into the lungs.

Step 2: Recognize that the increase in thoracic cavity volume leads to a decrease in intrapulmonary pressure (pressure within the lungs). This pressure drop creates a pressure gradient that allows air to flow into the lungs.

Step 3: Note that air flows into the lungs during inspiration due to the pressure gradient created by the decrease in intrapulmonary pressure. This is a fundamental principle of pulmonary ventilation.

Step 4: Understand that the diaphragm does NOT relax during inspiration. Instead, it contracts actively to facilitate the increase in thoracic cavity volume. Relaxation of the diaphragm occurs during expiration (exhalation).

Step 5: Based on the above steps, identify that the statement 'The diaphragm relaxes' does NOT occur during inspiration, as it contradicts the physiological process of inhalation.