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

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following actions is not performed concentrically by the trapezius muscle?

Retraction of the scapula

Protraction of the scapula

Depression of the scapula

Elevation of the scapula

Previous problemNext problem

Verified step by step guidance

Understand the function of the trapezius muscle: The trapezius is a large, triangular muscle located in the upper back. It is responsible for moving, rotating, and stabilizing the scapula (shoulder blade) and extending the neck.

Identify the actions performed by the trapezius muscle: The trapezius muscle can perform several actions, including elevation (lifting the scapula), retraction (pulling the scapula towards the spine), and depression (lowering the scapula).

Recognize the term 'concentrically': In muscle physiology, a concentric contraction occurs when a muscle shortens as it exerts force. This is typically the action performed when a muscle is actively moving a part of the body.

Evaluate the given actions: Retraction, depression, and elevation of the scapula are actions that the trapezius muscle can perform concentrically. Protraction, however, involves moving the scapula away from the spine, which is not a function of the trapezius.

Conclude which action is not performed concentrically by the trapezius: Since protraction of the scapula is not an action that the trapezius muscle performs, it is the correct answer to the question.