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 involved in elbow flexion acts primarily as a fixator to stabilize the shoulder joint during this movement?

Triceps brachii

Brachialis

Coracobrachialis

Biceps brachii

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Verified step by step guidance

Understand the concept of a fixator muscle: A fixator muscle stabilizes a joint or body part to allow other muscles to perform their primary movement effectively. In this case, the shoulder joint needs stabilization during elbow flexion.

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

Recognize the role of the coracobrachialis: The coracobrachialis is located in the upper arm and primarily functions to stabilize the shoulder joint by preventing unwanted movement during elbow flexion.

Compare the roles of the listed muscles: The triceps brachii is primarily responsible for elbow extension, not flexion. The brachialis is a prime mover for elbow flexion, while the biceps brachii assists in flexion and supination of the forearm. The coracobrachialis acts as a fixator for the shoulder joint during elbow flexion.

Conclude that the coracobrachialis is the correct answer because it stabilizes the shoulder joint, allowing the biceps brachii and brachialis to perform elbow flexion effectively.