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 classified as an extensor of the wrist and hand?

Flexor carpi ulnaris

Palmaris longus

Extensor carpi radialis longus

Flexor digitorum profundus

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Verified step by step guidance

Step 1: Understand the classification of muscles based on their function. Extensor muscles are responsible for increasing the angle between body parts, such as extending the wrist or fingers, while flexor muscles decrease the angle, such as flexing the wrist or fingers.

Step 2: Review the names and functions of the muscles listed in the problem. For example, 'Flexor carpi ulnaris' and 'Flexor digitorum profundus' are flexor muscles, meaning they are involved in bending the wrist or fingers. 'Palmaris longus' is also a flexor muscle that assists in wrist flexion.

Step 3: Identify the muscle that is classified as an extensor. The 'Extensor carpi radialis longus' is an extensor muscle, meaning it is responsible for extending the wrist and hand.

Step 4: Recall the anatomical location and action of the 'Extensor carpi radialis longus.' This muscle is located on the posterior side of the forearm and works to extend and abduct the wrist.

Step 5: Confirm the correct answer by matching the function of the muscle ('Extensor carpi radialis longus') with the classification provided in the question, ensuring it aligns with the definition of an extensor muscle.