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 arm flexion at the shoulder joint?

Deltoid (posterior fibers)

Latissimus dorsi

Pectoralis major

Trapezius

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Verified step by step guidance

Step 1: Understand the concept of a prime mover (agonist) in muscle actions. The prime mover is the muscle primarily responsible for producing a specific movement at a joint.

Step 2: Identify the movement described in the problem: arm flexion at the shoulder joint. Arm flexion involves moving the arm forward and upward in the sagittal plane.

Step 3: Review the anatomy and function of the muscles listed in the problem. For example: - Pectoralis major: A large chest muscle responsible for flexion, adduction, and medial rotation of the arm at the shoulder joint. - Deltoid (posterior fibers): These fibers are involved in extension and lateral rotation, not flexion. - Latissimus dorsi: This muscle is responsible for extension, adduction, and medial rotation of the arm, not flexion. - Trapezius: Primarily involved in scapular movements, such as elevation, depression, and retraction, not arm flexion.

Step 4: Match the muscle's function to the movement described. Since arm flexion at the shoulder joint is the focus, the pectoralis major is the muscle that acts as the prime mover for this action.

Step 5: Conclude that the pectoralis major is the correct answer based on its anatomical role in arm flexion at the shoulder joint.