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 of the following muscles is primarily responsible for extending the wrist and hand?

Extensor carpi radialis longus

Flexor carpi ulnaris

Flexor digitorum superficialis

Palmaris longus

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Verified step by step guidance

Step 1: Understand the function of the muscles listed in the options. The question asks for the muscle primarily responsible for extending the wrist and hand. Extension refers to increasing the angle between the bones at a joint, moving the hand away from the body.

Step 2: Analyze the role of the Extensor carpi radialis longus. This muscle is located on the posterior side of the forearm and is specifically involved in wrist extension and abduction of the hand.

Step 3: Examine the function of the Flexor carpi ulnaris. This muscle is located on the anterior side of the forearm and is responsible for flexing and adducting the wrist, not extending it.

Step 4: Review the role of the Flexor digitorum superficialis. This muscle is also located on the anterior side of the forearm and primarily flexes the fingers and wrist, not extending the wrist.

Step 5: Consider the function of the Palmaris longus. This muscle is involved in flexing the wrist and tensing the palmar aponeurosis, but it does not contribute to wrist extension. Based on this analysis, the Extensor carpi radialis longus is the correct answer.