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

What happens when your diaphragm relaxes and moves upward during the breathing process?

The volume of the thoracic cavity decreases, causing exhalation.

The pressure in the thoracic cavity increases, leading to inhalation.

The pressure in the thoracic cavity decreases, leading to inhalation.

The volume of the thoracic cavity increases, causing inhalation.

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Verified step by step guidance

Understand the role of the diaphragm in breathing: The diaphragm is a dome-shaped muscle that separates the thoracic cavity from the abdominal cavity. It plays a crucial role in the process of breathing by changing the volume of the thoracic cavity.

Identify the movement of the diaphragm during relaxation: When the diaphragm relaxes, it moves upward into the thoracic cavity, returning to its dome shape.

Analyze the effect of diaphragm relaxation on thoracic cavity volume: As the diaphragm moves upward, the volume of the thoracic cavity decreases because the space within the cavity is reduced.

Consider the relationship between volume and pressure in the thoracic cavity: According to Boyle's Law, when the volume of a closed space decreases, the pressure within that space increases.

Connect the changes in pressure to the breathing process: The increase in pressure within the thoracic cavity during diaphragm relaxation forces air out of the lungs, resulting in exhalation.