Question

what do you we detect that we are touching a hot object

Answer 1

When you touch an object that is hotter than your body temperature, heat flows into your body, which is picked up by neurons and you feel the sensation of heat and possibly getting burned. ... When your hand comes in contact with the hot body, due to temperature difference, heat flows from the body into your hand.

Answer 2

when we touch a hot object then the receptor take this signal through sensory neurones this message it transfer to the spinal cord and motor neuron connected to sensory neuron through relay neuron.

the spinal chord send message through motor neuron to the muscle in the hand .and in hand proteins tarnsfer takes place and the muscle contract and then our hand moves from their .

in this why we response to hot stimuli

hope it will help you