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 is true about the muscles active during breathing?

The abdominal muscles contract during inhalation.

The intercostal muscles relax during inhalation.

The diaphragm contracts during inhalation.

The diaphragm relaxes during 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 located at the base of the lungs. It plays a crucial role in the process of inhalation and exhalation.

Identify the action of the diaphragm during inhalation: During inhalation, the diaphragm contracts and moves downward, increasing the volume of the thoracic cavity and reducing the pressure inside, allowing air to flow into the lungs.

Consider the role of intercostal muscles: The external intercostal muscles also contract during inhalation, lifting the ribs and further expanding the thoracic cavity.

Evaluate the role of abdominal muscles: The abdominal muscles are primarily involved in forced exhalation, not inhalation. They contract to push the diaphragm upward during exhalation.

Conclude with the correct statement: Based on the understanding of muscle actions during breathing, the correct statement is that the diaphragm contracts during inhalation.