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 acts as the prime mover for shoulder flexion and adduction?

Trapezius

Pectoralis major

Latissimus dorsi

Deltoid

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Verified step by step guidance

Step 1: Understand the terms 'prime mover,' 'shoulder flexion,' and 'adduction.' The prime mover is the muscle primarily responsible for a specific movement. Shoulder flexion refers to moving the arm forward and upward, while adduction refers to bringing the arm closer to the body's midline.

Step 2: Analyze the function of each muscle listed in the options. The trapezius primarily stabilizes and moves the scapula, not directly involved in shoulder flexion or adduction. The latissimus dorsi is responsible for shoulder extension, adduction, and internal rotation, but not flexion.

Step 3: Examine the deltoid muscle. While the anterior fibers of the deltoid assist in shoulder flexion, the deltoid is not the prime mover for adduction; it primarily abducts the arm.

Step 4: Focus on the pectoralis major. This muscle is responsible for both shoulder flexion and adduction, making it the prime mover for these actions. It originates from the clavicle, sternum, and ribs, and inserts into the humerus.

Step 5: Conclude that the pectoralis major is the correct answer because it performs both shoulder flexion and adduction as its primary functions, unlike the other muscles listed.