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

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which muscle forms a dome between the thoracic and abdominal cavities?

External oblique

Pectoralis major

Rectus abdominis

Diaphragm

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Verified step by step guidance

Step 1: Understand the anatomical location of the thoracic and abdominal cavities. The thoracic cavity houses the lungs and heart, while the abdominal cavity contains organs like the stomach, liver, and intestines. These cavities are separated by a structure that plays a key role in respiration.

Step 2: Review the function of the diaphragm. The diaphragm is a dome-shaped muscle that separates the thoracic cavity from the abdominal cavity. It contracts and flattens during inhalation, increasing the volume of the thoracic cavity to draw air into the lungs.

Step 3: Compare the listed muscles to the diaphragm. The external oblique is part of the abdominal wall and assists in trunk rotation and flexion. The pectoralis major is a chest muscle involved in arm movement. The rectus abdominis is a muscle of the abdominal wall responsible for flexing the spine. None of these muscles form a dome or separate the two cavities.

Step 4: Identify the diaphragm as the correct answer based on its anatomical position and function. It is the only muscle listed that forms a dome and separates the thoracic and abdominal cavities.

Step 5: Reinforce the importance of the diaphragm in respiration and its unique structure, which makes it distinct from other muscles in the body.