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

In which reflex is there a quick contraction of flexor muscles in response to a painful stimulus?

Flexor (withdrawal) reflex

Crossed extensor reflex

Tendon reflex

Stretch reflex

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Verified step by step guidance

Begin by understanding the concept of reflexes in the human body. Reflexes are involuntary and nearly instantaneous movements in response to stimuli. They are crucial for protecting the body from harm.

Identify the different types of reflexes mentioned in the problem: Flexor (withdrawal) reflex, Crossed extensor reflex, Tendon reflex, and Stretch reflex. Each has a distinct function and response mechanism.

Focus on the Flexor (withdrawal) reflex. This reflex is specifically designed to protect the body from painful stimuli. When a painful stimulus is detected, sensory neurons send signals to the spinal cord, which then activates motor neurons to contract flexor muscles, pulling the affected part of the body away from the source of pain.

Consider the Crossed extensor reflex, which often accompanies the Flexor reflex. When the Flexor reflex is activated, the Crossed extensor reflex helps maintain balance by extending the opposite limb. This is particularly important in maintaining posture during a withdrawal action.

Review the Tendon reflex and Stretch reflex. The Tendon reflex helps prevent muscle damage by causing muscle relaxation when tension is too high, while the Stretch reflex helps maintain muscle tone and posture by causing muscle contraction in response to stretching.