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

13. The Peripheral Nervous System

Reflex Arcs

Anatomy & Physiology

13. The Peripheral Nervous System

Reflex Arcs

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Multiple Choice

The stretch reflex is initiated by a ______.

nociceptor

Pacinian corpuscle

Golgi tendon organ

muscle spindle

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Verified step by step guidance

Understand the stretch reflex: The stretch reflex is a protective mechanism that prevents overstretching of muscles. It is initiated when a muscle is stretched, causing a rapid contraction to maintain muscle length and posture.

Identify the sensory receptor involved: The stretch reflex is triggered by specialized sensory receptors called muscle spindles. These are located within the muscle and detect changes in muscle length and the rate of stretch.

Differentiate between the options: Nociceptors detect pain, Pacinian corpuscles detect pressure and vibration, and Golgi tendon organs monitor tension in tendons. None of these are responsible for detecting muscle stretch.

Focus on the correct receptor: Muscle spindles are the only sensory receptors specifically designed to detect stretch in muscles, making them the initiators of the stretch reflex.

Conclude the reasoning: Based on the function of muscle spindles and the nature of the stretch reflex, the correct answer is muscle spindle.