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

10. Muscles

Muscle Actions

Anatomy & Physiology

10. Muscles

Muscle Actions

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Problem 13d

Textbook Question

Mark the following statements as true or false. If the statement is false, correct it to make a true statement.
The deltoid muscle is a main abductor of the forearm.

Verified step by step guidance

Step 1: Begin by identifying the anatomical location and function of the deltoid muscle. The deltoid muscle is located in the shoulder region and is primarily responsible for abduction of the arm at the shoulder joint, not the forearm.

Step 2: Understand the distinction between the arm and forearm. The arm refers to the region between the shoulder and elbow, while the forearm refers to the region between the elbow and wrist.

Step 3: Evaluate the statement provided. The deltoid muscle is not involved in the movement of the forearm; its primary function is to abduct the arm at the shoulder joint.

Step 4: Correct the false statement. The corrected statement should read: 'The deltoid muscle is a main abductor of the arm.'

Step 5: Confirm the correction by reviewing the anatomy and function of the deltoid muscle to ensure the statement aligns with its role in the musculoskeletal system.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Deltoid Muscle Function

The deltoid muscle is primarily responsible for the abduction of the arm at the shoulder joint, not the forearm. It plays a crucial role in lifting the arm away from the body and is essential for various overhead movements.

Abduction

Abduction refers to the movement of a limb away from the midline of the body. In the context of the deltoid muscle, it specifically pertains to the arm's movement, highlighting the muscle's role in shoulder mobility rather than forearm movement.

Muscle Anatomy

Understanding muscle anatomy is vital for identifying the functions of different muscles. The deltoid is a large, triangular muscle located on the shoulder, and its anatomy allows it to perform specific movements, distinguishing it from muscles that act on the forearm.