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 occurs in the lungs during inspiration?

The thoracic cavity volume decreases.

Air flows out of the lungs.

Alveolar pressure increases above atmospheric pressure.

The diaphragm contracts and moves downward.

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Verified step by step guidance

Understand the process of inspiration: Inspiration is the phase of breathing where air is drawn into the lungs. It involves changes in thoracic cavity volume and pressure to facilitate airflow.

Recognize the role of the diaphragm: During inspiration, the diaphragm contracts and moves downward, increasing the vertical dimension of the thoracic cavity.

Analyze the effect on thoracic cavity volume: The contraction of the diaphragm, along with the external intercostal muscles lifting the rib cage, increases the thoracic cavity volume.

Understand the pressure changes: As the thoracic cavity volume increases, the pressure inside the alveoli (alveolar pressure) decreases below atmospheric pressure, creating a pressure gradient that allows air to flow into the lungs.

Eliminate incorrect options: The thoracic cavity volume does not decrease during inspiration, air does not flow out of the lungs, and alveolar pressure does not increase above atmospheric pressure during this phase. The correct answer is that the diaphragm contracts and moves downward.