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

1. Introduction to Anatomy & Physiology

Introduction to Anatomical Terms for Body Regions

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Anatomical Terms for Body Regions

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Multiple Choice

The middle fibers of the deltoid muscle are primarily responsible for which movement of the arm?

Abduction of the arm

Extension of the arm

Medial rotation of the arm

Flexion of the arm

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Verified step by step guidance

Step 1: Begin by identifying the anatomical location and function of the deltoid muscle. The deltoid is a triangular-shaped muscle located on the shoulder, and it is divided into three parts: anterior (front), middle, and posterior (back) fibers.

Step 2: Focus on the middle fibers of the deltoid muscle. These fibers originate from the acromion of the scapula and insert onto the deltoid tuberosity of the humerus. Their primary function is to move the arm away from the body, a movement known as abduction.

Step 3: Understand the term 'abduction.' Abduction refers to the movement of a limb away from the midline of the body. For the arm, this means lifting it sideways away from the torso.

Step 4: Compare the other options provided in the question. Extension refers to moving the arm backward, medial rotation involves rotating the arm toward the midline, and flexion refers to moving the arm forward. None of these movements are primarily performed by the middle fibers of the deltoid.

Step 5: Conclude that the middle fibers of the deltoid muscle are primarily responsible for abduction of the arm, as this is their main function based on their anatomical structure and location.