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 is primarily responsible for flexion of the elbow?

Deltoid

Pectoralis major

Triceps brachii

Biceps brachii

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Verified step by step guidance

Begin by understanding the action of flexion at the elbow joint. Flexion refers to the bending movement that decreases the angle between the forearm and the upper arm.

Identify the muscles involved in elbow flexion. The primary muscle responsible for this action is the biceps brachii, which is located in the anterior compartment of the upper arm.

Consider the anatomical position and function of the biceps brachii. It originates from the scapula and inserts into the radius, allowing it to flex the elbow when it contracts.

Review the roles of other muscles listed in the options: The deltoid is primarily involved in shoulder movements, the pectoralis major in chest movements, and the triceps brachii in elbow extension.

Conclude that the biceps brachii is the correct answer as it is the main muscle responsible for flexing the elbow, contrasting with the other muscles which have different primary functions.