In a vertebrate a reflex action is induced by:
Correct answer: A. Sensory nerve
- A. Sensory nerve
- B. Motor nerve
- C. Autonomic response
- D. Sympathetic nerve
Explanation
A is correct because in a reflex action, a sensory nerve is responsible for detecting a stimulus (such as heat, pain, etc.) and transmitting that information to the central nervous system (spinal cord or brain). The central nervous system then processes this information and initiates an immediate response without conscious thought. This quick, automatic response is carried out by motor nerves, which transmit signals from the central nervous system to the muscles or glands involved in the reflex action. This allows for a rapid and protective response to potentially harmful stimuli.
This question appeared on the KMU Centralized Admission Test 2022 paper, which you can sit online with every answer explained.
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About Reflexes and the Reflex Arc
A reflex arc shows how a rapid, automatic response travels from a receptor through a sensory neuron, relay neuron and motor neuron to an effector. The topic covers synapses, the spinal cord's role, and the difference between an involuntary reflex action and a slower voluntary response.
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