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

Organization of the Body: Thoracic Cavity

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Organization of the Body: Thoracic Cavity

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Multiple Choice

Which event enlarges the thoracic cavity?

Relaxation of the diaphragm

Relaxation of the intercostal muscles

Contraction of the abdominal muscles

Contraction of the diaphragm

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Verified step by step guidance

Understand the anatomy of the thoracic cavity: The thoracic cavity is the chamber of the body that is protected by the thoracic wall (rib cage and associated muscles). It houses the lungs and heart.

Identify the role of the diaphragm: The diaphragm is a dome-shaped muscle located at the base of the lungs. It plays a crucial role in respiration by changing the volume of the thoracic cavity.

Recognize the process of inhalation: During inhalation, the diaphragm contracts and moves downward, increasing the vertical dimension of the thoracic cavity. This contraction creates a negative pressure that allows air to flow into the lungs.

Differentiate between muscle actions: Contraction of the diaphragm enlarges the thoracic cavity, while relaxation of the diaphragm and intercostal muscles, or contraction of the abdominal muscles, do not increase the thoracic cavity's volume.

Conclude the correct event: Based on the understanding of muscle actions and their effects on the thoracic cavity, the contraction of the diaphragm is the event that enlarges the thoracic cavity.