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

Why are gills typically external structures while lungs are typically internal structures in organisms?

Gills are external to maximize exposure to water for gas exchange, while lungs are internal to minimize water loss in terrestrial environments.

Gills are external to facilitate buoyancy, while lungs are internal to maintain body temperature.

Gills are external because they require less energy to function, while lungs are internal to protect them from predators.

Gills are external to allow for faster movement in water, while lungs are internal to support higher metabolic rates.

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Verified step by step guidance

Understand the primary function of gills and lungs: Both gills and lungs are respiratory structures that facilitate gas exchange, allowing organisms to take in oxygen and expel carbon dioxide.

Consider the environment in which each structure operates: Gills are found in aquatic environments, while lungs are found in terrestrial environments.

Analyze the structural adaptation of gills: Gills are external structures that maximize exposure to water, which is necessary for efficient gas exchange in aquatic environments. This exposure allows water to flow over the gill surfaces, facilitating the diffusion of gases.

Examine the structural adaptation of lungs: Lungs are internal structures that help minimize water loss, which is crucial for survival in terrestrial environments. By being internal, lungs reduce the risk of desiccation and allow for the regulation of moisture and temperature.

Evaluate the evolutionary advantages: The external placement of gills supports buoyancy and efficient gas exchange in water, while the internal placement of lungs protects them from environmental hazards and supports higher metabolic rates in land-dwelling organisms.