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 assists in both pronation and supination of the forearm?

Flexor carpi radialis

Supinator

Pronator teres

Brachioradialis

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Verified step by step guidance

Understand the movements of pronation and supination: Pronation refers to the rotation of the forearm so the palm faces downward, while supination refers to the rotation of the forearm so the palm faces upward.

Review the function of the brachioradialis muscle: The brachioradialis is primarily a flexor of the elbow, but it also plays a role in assisting both pronation and supination when the forearm is in a neutral position (thumb pointing upward).

Compare the roles of the other muscles listed: The flexor carpi radialis is involved in wrist flexion and abduction, the supinator is specifically responsible for supination, and the pronator teres is specifically responsible for pronation. None of these muscles assist in both movements.

Identify the unique role of the brachioradialis: The brachioradialis helps stabilize the forearm during transitions between pronation and supination, making it the correct answer for a muscle that assists in both movements.

Conclude that the brachioradialis is the correct answer based on its dual role in forearm movement and its neutral positioning function during pronation and supination.