What is the pathway of a reflex action?

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Stimulus, sensory neuron, interneuron, motor neuron, response

Stimulus, motor neuron, interneuron, sensory neuron, response

Sensory neuron, interneuron, motor neuron, stimulus, response

Motor neuron, sensory neuron, interneuron, stimulus, response

answer is A.

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Detailed Solution

The pathway of a reflex action is:
Stimulus → Sensory neuron → Interneuron → Motor neuron → Response

Stimulus: The first step in the reflex arc is the detection of a stimulus by a sensory receptor, which can be located in the skin, muscle, or other tissues.

Sensory neuron: Once the stimulus is detected, the sensory receptor sends a signal to a sensory neuron, which carries the information from the receptor to the spinal cord.

Interneuron: In the spinal cord, the sensory neuron synapses with an interneuron, which processes the incoming information and determines the appropriate response.

Motor neuron: If the interneuron determines that a response is necessary, it sends a signal to a motor neuron, which carries the information from the spinal cord to the effector, such as a muscle or gland.

Response: The final step in the reflex arc is the response of the effector, which carries out the action that is needed in response to the stimulus.

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