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

What is the extrusion reflex in the context of reflex arcs?

A reflex that causes the tongue to push objects out of the mouth

A reflex that causes the hand to withdraw from a hot surface

A reflex that causes the pupil to constrict in bright light

A reflex that causes the knee to jerk when tapped

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Verified step by step guidance

Understand the concept of a reflex arc: A reflex arc is a neural pathway that controls a reflex action. It typically involves a sensory neuron, an interneuron, and a motor neuron, resulting in a quick, involuntary response to a stimulus.

Identify the specific reflexes mentioned: The problem lists four reflexes: extrusion reflex, withdrawal reflex, pupillary light reflex, and knee-jerk reflex.

Define the extrusion reflex: The extrusion reflex is a primitive reflex in infants that causes the tongue to push objects out of the mouth. It is a protective mechanism to prevent choking and is typically present in infants up to 4-6 months of age.

Differentiate between the reflexes: Compare the extrusion reflex with the other reflexes mentioned. The withdrawal reflex involves pulling away from a painful stimulus, the pupillary light reflex involves constriction of the pupil in response to bright light, and the knee-jerk reflex is a response to tapping the patellar tendon.

Conclude by matching the definition: Based on the definitions, the extrusion reflex is the one that causes the tongue to push objects out of the mouth, distinguishing it from the other reflexes listed.