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 a reflex arc, the __________ transmits afferent impulses to the CNS.

effector

interneuron

motor neuron

sensory neuron

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Verified step by step guidance

Step 1: Understand the concept of a reflex arc. A reflex arc is the neural pathway that controls a reflex action. It typically involves five components: receptor, sensory neuron, integration center, motor neuron, and effector.

Step 2: Identify the role of each component in the reflex arc. The receptor detects the stimulus, the sensory neuron transmits afferent impulses to the central nervous system (CNS), the integration center processes the information, the motor neuron transmits efferent impulses, and the effector carries out the response.

Step 3: Focus on the term 'afferent impulses.' Afferent impulses are signals traveling toward the CNS, which are carried by sensory neurons. This is distinct from efferent impulses, which travel away from the CNS and are carried by motor neurons.

Step 4: Eliminate incorrect options based on their roles. The effector is the structure that performs the response (e.g., muscle or gland), the interneuron is involved in processing within the CNS, and the motor neuron transmits efferent impulses. None of these transmit afferent impulses to the CNS.

Step 5: Conclude that the sensory neuron is the correct answer because it is responsible for transmitting afferent impulses to the CNS in a reflex arc.