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 of the following muscles is primarily responsible for flexing the arm at the glenohumeral (shoulder) joint?

Latissimus dorsi

Pectoralis major

Teres minor

Infraspinatus

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Verified step by step guidance

Step 1: Understand the action described in the question. Flexion of the arm at the glenohumeral joint refers to moving the arm forward and upward, decreasing the angle between the arm and the front of the body.

Step 2: Review the primary functions of each muscle listed in the options. For example: - Latissimus dorsi: Primarily responsible for extension, adduction, and medial rotation of the arm. - Pectoralis major: Responsible for flexion, adduction, and medial rotation of the arm. - Teres minor: Functions in lateral rotation and stabilization of the shoulder joint. - Infraspinatus: Also involved in lateral rotation and stabilization of the shoulder joint.

Step 3: Identify which muscle is anatomically positioned to perform flexion at the glenohumeral joint. The pectoralis major is located on the anterior chest and connects to the humerus, making it well-suited for flexion.

Step 4: Eliminate muscles that do not contribute to flexion. For example, the latissimus dorsi is involved in extension (opposite of flexion), and the teres minor and infraspinatus are primarily rotator cuff muscles responsible for rotation and stabilization.

Step 5: Conclude that the pectoralis major is the muscle primarily responsible for flexing the arm at the glenohumeral joint based on its anatomical position and function.