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

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Multiple Choice

Which of the following best describes the action of the palmaris longus muscle?

It pronates the forearm

It flexes the wrist

It extends the fingers

It abducts the thumb

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Verified step by step guidance

Step 1: Begin by identifying the palmaris longus muscle. It is a superficial muscle located in the anterior compartment of the forearm.

Step 2: Understand the primary function of the palmaris longus muscle. Its main action is to assist in flexing the wrist by pulling on the palmar aponeurosis, a fibrous structure in the hand.

Step 3: Eliminate incorrect options based on anatomical knowledge. For example, pronation of the forearm is performed by muscles like the pronator teres and pronator quadratus, not the palmaris longus.

Step 4: Similarly, extending the fingers is the action of extensor muscles located in the posterior compartment of the forearm, such as the extensor digitorum. Abducting the thumb is performed by muscles like the abductor pollicis longus and abductor pollicis brevis.

Step 5: Conclude that the correct action of the palmaris longus muscle is flexion of the wrist, as this aligns with its anatomical location and function.