Table of contents

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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

10. Muscles

Origin and Insertion

Anatomy & Physiology

10. Muscles

Origin and Insertion

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Multiple Choice

Which of the following muscles aids inspiration by lifting the first two ribs?

diaphragm

internal intercostals

the scalenes

rectus abdominis

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Verified step by step guidance

Begin by understanding the process of inspiration, which is the act of drawing air into the lungs. This involves the expansion of the thoracic cavity.

Identify the muscles involved in inspiration. The primary muscle is the diaphragm, which contracts and flattens, increasing the volume of the thoracic cavity.

Consider the role of accessory muscles in inspiration. These muscles assist in further expanding the thoracic cavity, especially during deep or labored breathing.

Focus on the scalenes, which are a group of muscles located in the neck. They play a role in lifting the first two ribs, thereby aiding in the expansion of the thoracic cavity during inspiration.

Understand that while the diaphragm is the main muscle for inspiration, the scalenes are important for elevating the ribs and assisting in the process, especially during increased respiratory demand.