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

10. Muscles

Muscle Naming

Anatomy & Physiology

10. Muscles

Muscle Naming

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2:50 minutes

Problem 4

Textbook Question

The prime mover of inspiration is the:
a. Diaphragm
b. Internal intercostals
c. External intercostals
d. Abdominal wall muscles

Verified step by step guidance

Understand the concept of inspiration: Inspiration is the process of drawing air into the lungs, which requires the expansion of the thoracic cavity to create a pressure gradient.

Identify the primary muscle responsible for expanding the thoracic cavity: The diaphragm is the main muscle involved in increasing the volume of the thoracic cavity during inspiration.

Learn the role of the diaphragm: When the diaphragm contracts, it moves downward, increasing the vertical dimension of the thoracic cavity and reducing intrathoracic pressure, allowing air to flow into the lungs.

Differentiate between accessory muscles: The external intercostals assist in elevating the ribs during inspiration, while the internal intercostals and abdominal wall muscles are primarily involved in forced expiration rather than inspiration.

Conclude that the prime mover of inspiration is the diaphragm, as it is the most significant muscle responsible for the process of normal breathing.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Diaphragm

The diaphragm is a dome-shaped muscle located at the base of the thoracic cavity. It plays a crucial role in respiration by contracting and flattening during inhalation, which increases the volume of the thoracic cavity and allows air to flow into the lungs. It is considered the primary muscle of inspiration.

Intercostal Muscles

The intercostal muscles are located between the ribs and are divided into internal and external types. The external intercostals assist in inhalation by elevating the ribs and expanding the chest cavity, while the internal intercostals primarily aid in forced exhalation. Understanding their function is essential for grasping the mechanics of breathing.

Abdominal Wall Muscles

The abdominal wall muscles, including the rectus abdominis and obliques, primarily function in forced expiration rather than inspiration. They help push air out of the lungs by compressing the abdominal cavity, which can be important during vigorous activities or when the body requires rapid exhalation.

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Related Practice

Textbook Question

Name the three pennate muscles in the following figure, and for each muscle indicate the type of pennate muscle based on the relationship of muscle fascicles to the tendon.

<IMAGE>

a. ___

b. ___

c. ___

d. ___

e. ___

f. ___

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