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 is responsible for adducting the shoulder and causing extension of the shoulder joint?

Pectoralis major

Latissimus dorsi

Deltoid

Biceps brachii

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Verified step by step guidance

Step 1: Understand the action described in the question. Adduction refers to the movement of a limb toward the midline of the body, and extension of the shoulder joint involves moving the arm backward, away from the body.

Step 2: Review the functions of the muscles listed in the options. For example, the pectoralis major primarily assists in flexion, adduction, and medial rotation of the shoulder, but it does not cause extension.

Step 3: Analyze the latissimus dorsi muscle. This muscle is responsible for adduction, extension, and medial rotation of the shoulder joint, making it the correct answer based on the described actions.

Step 4: Examine the deltoid muscle. The deltoid is primarily involved in abduction of the shoulder and assists in flexion and extension depending on the specific fibers activated, but it does not primarily adduct the shoulder.

Step 5: Consider the biceps brachii. This muscle is primarily involved in flexion of the elbow and supination of the forearm, and while it assists in shoulder flexion, it does not contribute to adduction or extension of the shoulder joint.