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 the primary function of surfactant in the alveoli of the lungs?

To reduce surface tension and prevent alveolar collapse

To increase the diffusion rate of oxygen

To transport carbon dioxide out of the blood

To stimulate the contraction of respiratory muscles

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Verified step by step guidance

Understand the role of surfactant: Surfactant is a substance secreted by type II alveolar cells in the lungs. Its primary function is to reduce surface tension within the alveoli, which are the tiny air sacs where gas exchange occurs.

Recall the concept of surface tension: Surface tension is caused by the cohesive forces between water molecules lining the alveoli. Without surfactant, this tension would cause the alveoli to collapse, especially during exhalation when the alveoli are smaller.

Connect the function of surfactant to alveolar stability: By reducing surface tension, surfactant helps maintain the structural integrity of the alveoli, ensuring they remain open and capable of participating in gas exchange.

Eliminate incorrect options: Increasing the diffusion rate of oxygen, transporting carbon dioxide, and stimulating respiratory muscle contraction are not functions of surfactant. These processes involve other physiological mechanisms.

Conclude with the correct answer: The primary function of surfactant is to reduce surface tension and prevent alveolar collapse, ensuring efficient gas exchange in the lungs.