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 Heart2h 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

Lung Volumes and Capacities

Anatomy & Physiology

22. The Respiratory System

Lung Volumes and Capacities

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Multiple Choice

Under normal conditions which of the following volumes do you expect to be the smallest?

Expiratory reserve volume (ERV).

Tidal Volume (TV).

Residual Volume (RV).

Inspiratory Reserve Volume (IRV).

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Verified step by step guidance

Understand the definitions of each lung volume: Tidal Volume (TV) is the amount of air inhaled or exhaled during normal breathing. Expiratory Reserve Volume (ERV) is the additional air that can be exhaled after a normal exhalation. Residual Volume (RV) is the air remaining in the lungs after a maximal exhalation. Inspiratory Reserve Volume (IRV) is the additional air that can be inhaled after a normal inhalation.

Recognize that Tidal Volume (TV) is typically the smallest volume because it represents the normal, resting breathing volume, which is less than the additional volumes that can be inhaled or exhaled with effort.

Compare the typical values of these volumes: TV is usually around 500 mL, ERV is about 1000-1200 mL, RV is approximately 1200 mL, and IRV is around 1900-3100 mL.

Consider the physiological purpose of each volume: TV is meant for regular, effortless breathing, while ERV, RV, and IRV are involved in more forceful breathing actions or maintaining lung inflation.

Conclude that under normal conditions, Tidal Volume (TV) is expected to be the smallest volume compared to ERV, RV, and IRV, due to its role in regular, resting breathing.