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 Heart2h 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

The prime movers of back extension are the __________.

sternocleidomastoid muscles

erector spinae muscles

scalene muscles

latissimus dorsi muscles

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Verified step by step guidance

Understand the function of back extension: Back extension involves straightening the spine and returning it to an upright position from a flexed position.

Identify the muscles involved in back extension: The primary muscles responsible for this movement are known as the prime movers.

Review the anatomy of the back: The erector spinae muscles are a group of muscles and tendons that run the length of the spine on both sides, playing a crucial role in extending the back.

Differentiate between the muscle groups: The sternocleidomastoid muscles are located in the neck and are involved in head movement, not back extension. The scalene muscles also assist in neck movement. The latissimus dorsi muscles are involved in arm movement and do not primarily extend the back.

Conclude that the erector spinae muscles are the prime movers for back extension, as they are specifically designed to extend and stabilize the spine.