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

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which muscle acts as the prime mover of elbow flexion?

Deltoid

Brachioradialis

Triceps brachii

Biceps brachii

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Verified step by step guidance

Understand the concept of a prime mover: A prime mover (or agonist) is the muscle primarily responsible for producing a specific movement. In this case, the movement is elbow flexion.

Review the anatomy of the elbow joint: Elbow flexion involves decreasing the angle between the forearm and the upper arm. The muscles responsible for this movement are located in the anterior compartment of the arm.

Identify the muscles involved in elbow flexion: The key muscles include the biceps brachii, brachialis, and brachioradialis. Among these, the biceps brachii is the most powerful and acts as the prime mover.

Understand the role of the biceps brachii: The biceps brachii has two heads (long and short) that originate from the scapula and insert on the radius. Its contraction pulls the forearm upward, causing elbow flexion.

Compare the other options: The deltoid is primarily responsible for shoulder movements, not elbow flexion. The brachioradialis assists in elbow flexion but is not the prime mover. The triceps brachii is responsible for elbow extension, the opposite of flexion.