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

Pressure in the Lungs and Pleural Cavity

Anatomy & Physiology

22. The Respiratory System

Pressure in the Lungs and Pleural Cavity

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Multiple Choice

Pleural effusion is a condition where fluid accumulates in the pleural cavity. Which pressure or pressures would you expect to be most directly impacted by this fluid accumulation?

Intrapleural pressure.

Intrapulmonary pressure.

Both A & B are correct.

Neither pressure would be impacted.

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Verified step by step guidance

Understand the anatomy of the pleural cavity: The pleural cavity is the space between the visceral and parietal pleurae surrounding the lungs. It normally contains a small amount of lubricating fluid.

Define intrapleural pressure: Intrapleural pressure is the pressure within the pleural cavity. It is usually negative relative to atmospheric pressure, which helps keep the lungs expanded.

Define intrapulmonary pressure: Intrapulmonary pressure, also known as alveolar pressure, is the pressure within the alveoli of the lungs. It changes during breathing, becoming negative during inspiration and positive during expiration.

Analyze the effect of fluid accumulation: When fluid accumulates in the pleural cavity (pleural effusion), it can alter the normal negative intrapleural pressure, potentially making it less negative or even positive, which can affect lung expansion.

Consider the impact on pressures: Since the fluid directly affects the pleural cavity, the intrapleural pressure is most directly impacted. Intrapulmonary pressure may also be indirectly affected due to changes in lung expansion, but the primary impact is on intrapleural pressure.