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 Actions

Anatomy & Physiology

10. Muscles

Muscle Actions

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Multiple Choice

Which muscle is responsible for the rotation of the scapula and depression of the shoulder?

Pectoralis Major

Trapezius

Latissimus Dorsi

Deltoid

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Verified step by step guidance

Begin by identifying the primary functions of each muscle listed in the options. Understanding these functions will help determine which muscle is responsible for the specific actions mentioned in the problem.

The Pectoralis Major is primarily responsible for movements of the shoulder joint, such as flexion, adduction, and internal rotation of the humerus. It does not primarily rotate the scapula or depress the shoulder.

The Latissimus Dorsi is involved in the extension, adduction, and internal rotation of the shoulder joint. It also assists in the downward rotation of the scapula but is not primarily responsible for scapular rotation or shoulder depression.

The Deltoid muscle is mainly responsible for abduction, flexion, and extension of the shoulder. It does not play a significant role in scapular rotation or shoulder depression.

The Trapezius muscle is responsible for several actions, including the rotation of the scapula and depression of the shoulder. It is divided into upper, middle, and lower fibers, with the lower fibers contributing to scapular rotation and shoulder depression.