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 NOT part of the respiratory membrane of the lungs?

Alveolar epithelial cell

Basement membrane

Smooth muscle cell

Capillary endothelial cell

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Verified step by step guidance

Step 1: Begin by understanding the structure and function of the respiratory membrane. The respiratory membrane is the site of gas exchange in the lungs, where oxygen and carbon dioxide are exchanged between the alveoli and the blood in the capillaries.

Step 2: Identify the components of the respiratory membrane. It consists of three main layers: (1) the alveolar epithelial cells, which form the lining of the alveoli, (2) the fused basement membrane, which provides structural support and connects the alveolar epithelium to the capillary endothelium, and (3) the capillary endothelial cells, which form the lining of the capillaries.

Step 3: Analyze the options provided in the question. Alveolar epithelial cells, basement membrane, and capillary endothelial cells are all part of the respiratory membrane. Smooth muscle cells, however, are not part of the respiratory membrane; they are found in the walls of bronchi and bronchioles to regulate airflow but do not participate in gas exchange.

Step 4: Understand why smooth muscle cells are excluded. Smooth muscle cells are involved in controlling the diameter of airways and are not directly involved in the structure or function of the respiratory membrane.

Step 5: Conclude that the correct answer is 'Smooth muscle cell,' as it is not part of the respiratory membrane, unlike the other components listed.