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 true at the venous ends of the pulmonary capillaries?

Oxygen levels are higher than carbon dioxide levels.

The blood is at its lowest oxygen saturation.

Blood is deoxygenated and rich in carbon dioxide.

Carbon dioxide levels are higher than oxygen levels.

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Verified step by step guidance

Understand the function of pulmonary capillaries: Pulmonary capillaries are involved in gas exchange between the blood and the alveoli in the lungs. Oxygen is absorbed into the blood, and carbon dioxide is released into the alveoli to be exhaled.

Identify the direction of gas exchange: At the venous end of the pulmonary capillaries, blood has just passed through the alveolar capillaries where gas exchange occurs. Oxygen is taken up by the blood, and carbon dioxide is released.

Consider the oxygen and carbon dioxide levels: After gas exchange, the blood leaving the pulmonary capillaries (venous end) will have higher oxygen levels compared to carbon dioxide levels because it has been oxygenated.

Evaluate the options: The statement 'Oxygen levels are higher than carbon dioxide levels' aligns with the physiological process occurring at the venous end of the pulmonary capillaries.

Conclude the analysis: Based on the understanding of pulmonary gas exchange, the correct statement is that oxygen levels are higher than carbon dioxide levels at the venous ends of the pulmonary capillaries.