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 correctly describes the process of inspiration (air entering the lungs)?

The intercostal muscles contract, causing the rib cage to move downward and inward.

The diaphragm contracts and moves downward, increasing thoracic volume and decreasing pressure.

The diaphragm relaxes and moves upward, decreasing thoracic volume and increasing pressure.

The lungs contract, forcing air out of the alveoli.

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Verified step by step guidance

Understand the basic mechanics of breathing: Inspiration is the process of drawing air into the lungs, which involves changes in thoracic volume and pressure.

Identify the role of the diaphragm: During inspiration, the diaphragm contracts and moves downward. This movement is crucial for increasing the volume of the thoracic cavity.

Recognize the effect on thoracic volume: As the diaphragm contracts and moves downward, the thoracic cavity's volume increases. This is a key factor in the process of inspiration.

Understand the pressure changes: According to Boyle's Law, an increase in volume leads to a decrease in pressure. As the thoracic volume increases, the pressure inside the thoracic cavity decreases.

Relate pressure changes to air movement: The decrease in thoracic pressure creates a pressure gradient, causing air to flow into the lungs from the higher pressure outside environment, thus completing the process of inspiration.