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 primarily responsible for rotating the scapula upward during arm elevation?

Latissimus dorsi

Pectoralis major

Biceps brachii

Serratus anterior

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Verified step by step guidance

Step 1: Understand the anatomy of the scapula and its movement during arm elevation. The scapula is a flat bone that plays a key role in shoulder mobility, and upward rotation is essential for raising the arm above the head.

Step 2: Identify the muscles involved in scapular movement. The serratus anterior, trapezius, and rhomboid muscles are key contributors to scapular motion. Specifically, the serratus anterior is known for its role in upward rotation.

Step 3: Analyze the function of the serratus anterior. This muscle originates from the upper ribs and inserts on the medial border of the scapula. Its contraction pulls the scapula forward and upward, facilitating arm elevation.

Step 4: Compare the functions of the other muscles listed in the problem. The latissimus dorsi is primarily responsible for arm adduction and extension, the pectoralis major assists in arm flexion and adduction, and the biceps brachii is involved in elbow flexion and forearm supination. None of these muscles contribute significantly to scapular upward rotation.

Step 5: Conclude that the serratus anterior is the primary muscle responsible for rotating the scapula upward during arm elevation, based on its anatomical position and function.