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 primarily responsible for lifting the arm above the head when a woman raises a ball overhead?

Pectoralis major

Biceps brachii

Deltoid

Trapezius

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Verified step by step guidance

Step 1: Understand the movement described in the problem. Raising the arm above the head involves shoulder abduction, which is the movement of the arm away from the body in the frontal plane.

Step 2: Identify the primary muscle responsible for shoulder abduction. The deltoid muscle, specifically its middle fibers, is the primary muscle responsible for lifting the arm above the head.

Step 3: Consider the other muscles listed in the problem. The pectoralis major is primarily involved in shoulder flexion and adduction, not abduction. The biceps brachii is involved in elbow flexion and forearm supination, not lifting the arm overhead. The trapezius is involved in stabilizing and moving the scapula, but it does not directly lift the arm above the head.

Step 4: Confirm the correct answer based on anatomical function. The deltoid muscle is the correct answer because it is the primary muscle responsible for shoulder abduction, which is the movement required to lift the arm above the head.

Step 5: Review the anatomy of the deltoid muscle. The deltoid has three parts: anterior, middle, and posterior fibers. The middle fibers are specifically responsible for shoulder abduction, making them the key contributors to the movement described in the problem.