Question

On touching a hot plate you suddenly withdraw your hand which category of neurons became active first and which one next

Answer 1

the receptors receive the changes in the stimulus then an electric signal is generated then the message is carried by sensory neuron to spinal cord. spinal cord acts as a modulator and converts sensory information into motor information. this information through motor neuron is carried to the effector organ which then performs according to the message given by spinal cord.

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Answer 2

Firstly sensory neurons and than motor neurons become active.