Table of contents

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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 flex?

Biceps brachii

Triceps brachii

Brachialis

Brachioradialis

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Verified step by step guidance

Understand the anatomy of the elbow joint: The elbow joint is primarily controlled by muscles that either flex or extend the forearm.

Identify the muscles involved in elbow flexion: The primary muscles responsible for flexing the elbow are the biceps brachii, brachialis, and brachioradialis.

Recognize the role of the triceps brachii: The triceps brachii is the muscle responsible for extending the elbow, and it must relax to allow the elbow to flex.

Consider the action of antagonistic muscles: In the process of flexing the elbow, the triceps brachii acts as an antagonist to the flexor muscles, meaning it must relax to permit flexion.

Conclude the relationship between muscle actions: When the elbow flexes, the triceps brachii relaxes, allowing the biceps brachii, brachialis, and brachioradialis to contract and flex the elbow.