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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Multiple Choice

Which muscle contracts to extend the elbow?

Deltoid

Triceps brachii

Brachialis

Biceps brachii

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Verified step by step guidance

Understand the anatomy of the elbow joint: The elbow joint is a hinge joint formed by the humerus, radius, and ulna. It allows for flexion and extension movements.

Identify the muscles involved in elbow extension: The primary muscle responsible for extending the elbow is the triceps brachii. It is located on the posterior side of the upper arm.

Learn the function of the triceps brachii: The triceps brachii has three heads (long, lateral, and medial) that converge into a single tendon attaching to the olecranon process of the ulna. When it contracts, it extends the elbow joint.

Differentiate between muscles involved in flexion and extension: While the triceps brachii extends the elbow, muscles like the biceps brachii and brachialis are primarily involved in flexing the elbow.

Review the role of the deltoid muscle: The deltoid muscle is primarily responsible for shoulder movements, such as abduction, flexion, and extension, but not directly involved in elbow extension.