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 structures is NOT a component of the respiratory membrane in the lungs?

Fused basement membrane

Alveolar epithelial cell

Smooth muscle cell

Capillary endothelial cell

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Verified step by step guidance

Understand the respiratory membrane: The respiratory membrane is the site of gas exchange in the lungs, consisting of structures that facilitate the diffusion of oxygen and carbon dioxide between the alveoli and capillaries.

Identify the components of the respiratory membrane: The respiratory membrane includes the alveolar epithelial cell, the fused basement membrane (shared by alveolar epithelium and capillary endothelium), and the capillary endothelial cell.

Recognize the role of smooth muscle cells: Smooth muscle cells are not part of the respiratory membrane. They are found in the walls of bronchi and bronchioles, where they help regulate airflow by contracting or relaxing, but they do not participate in gas exchange.

Compare the listed structures: Fused basement membrane, alveolar epithelial cell, and capillary endothelial cell are all components of the respiratory membrane, while smooth muscle cells are not.

Conclude the correct answer: Smooth muscle cells are not a component of the respiratory membrane because they are not involved in the gas exchange process.