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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

What effect does contraction of the diaphragm have on the volume of the thoracic cavity?

It decreases the volume of the thoracic cavity.

It causes the thoracic cavity to collapse.

It increases the volume of the thoracic cavity.

It has no effect on the volume of the thoracic cavity.

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Verified step by step guidance

Understand the anatomy of the diaphragm: The diaphragm is a dome-shaped muscle located at the base of the lungs, separating the thoracic cavity from the abdominal cavity.

Recognize the role of the diaphragm in respiration: During inhalation, the diaphragm contracts and moves downward, which is a key action in the breathing process.

Analyze the effect of diaphragm contraction: When the diaphragm contracts, it flattens and moves downward, increasing the vertical dimension of the thoracic cavity.

Consider the relationship between volume and pressure: According to Boyle's Law, an increase in the volume of the thoracic cavity leads to a decrease in pressure, allowing air to flow into the lungs.

Conclude the effect on thoracic cavity volume: The contraction of the diaphragm increases the volume of the thoracic cavity, facilitating the process of inhalation.