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 relaxes to allow the elbow to extend?

Triceps brachii

Biceps brachii

Brachialis

Deltoid

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Verified step by step guidance

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

Identify the muscles involved in elbow movement: The primary muscles responsible for elbow flexion are the biceps brachii and brachialis, while the triceps brachii is responsible for elbow extension.

Determine the role of each muscle: The biceps brachii and brachialis contract to flex the elbow, while the triceps brachii contracts to extend the elbow.

Recognize the concept of antagonistic muscle pairs: In the context of the elbow, the biceps brachii and triceps brachii are antagonistic pairs. When one contracts, the other relaxes to allow movement in the opposite direction.

Apply the concept to the problem: To allow the elbow to extend, the triceps brachii contracts, and the biceps brachii must relax. Therefore, the muscle that relaxes to allow elbow extension is the biceps brachii.