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

4. Tissues & Histology

Introduction to Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Muscle Tissue

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Multiple Choice

Which of the following best describes the primary function of a muscle spindle in skeletal muscle?

Detects changes in muscle length and initiates a reflex to resist stretching

Stores calcium ions for muscle contraction

Transmits pain signals from damaged muscle fibers

Generates force for voluntary muscle contraction

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Verified step by step guidance

Understand the anatomy and physiology of a muscle spindle: Muscle spindles are specialized sensory receptors located within skeletal muscles. They are responsible for detecting changes in muscle length and play a key role in proprioception (the sense of body position and movement).

Recognize the primary function of muscle spindles: Muscle spindles monitor the stretch of a muscle and initiate a reflex response to resist excessive stretching, helping maintain muscle tone and prevent injury.

Eliminate incorrect options: 'Stores calcium ions for muscle contraction' refers to the sarcoplasmic reticulum, not the muscle spindle. 'Transmits pain signals from damaged muscle fibers' is the role of nociceptors, not muscle spindles. 'Generates force for voluntary muscle contraction' is the function of muscle fibers themselves, not the spindle.

Focus on the correct option: The muscle spindle detects changes in muscle length and initiates a reflex to resist stretching, which aligns with its role in maintaining muscle tone and preventing overstretching.

Summarize the concept: Muscle spindles are sensory structures that contribute to the stretch reflex, ensuring muscles respond appropriately to changes in length and maintain proper function during movement.