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

1. Introduction to Anatomy & Physiology

Introduction to Directional Terms

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Directional Terms

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Multiple Choice

Contraction of the internal intercostals ______ the ribs.

rotates

extends

elevates

depresses

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Verified step by step guidance

Understand the role of the internal intercostal muscles: These muscles are located between the ribs and are involved in respiration, specifically during forced expiration.

Recall the mechanics of breathing: During forced expiration, the internal intercostals contract to pull the ribs downward, reducing the volume of the thoracic cavity and aiding in expelling air from the lungs.

Differentiate the actions of the internal intercostals from the external intercostals: While external intercostals elevate the ribs during inspiration, internal intercostals depress the ribs during forced expiration.

Match the action of the internal intercostals to the correct term: The term 'depresses' accurately describes the downward movement of the ribs caused by the contraction of the internal intercostals.

Conclude that the correct answer is 'depresses' based on the anatomical function of the internal intercostals during forced expiration.