I believe its the sensory neuron and the the sense organ to the brain as the sense nerves in his hand would feel the pain and send that information to the brain so it can react
The right answer is sense organ (the hand's skin which contains terminal nerves sensitive to the temperature change)
Balance is in fact the result of the interaction between man and his environment. Sensors (sensory organs) continuously inform our brain about the position and movement of our body.
Internal sensors are located in the muscles, joints and vestibule of the inner ear. The external sensors are, on the one hand, in the skin, to inform us about our contact with the environment, and, on the other hand, in the retina, to inform us about the near and far visual environment.
Histamine increases the vasodilatation, and also increases the vascular permeability in the immediate transient phase of the acute inflammatory reaction. This histamine also acts as a chemical mediator in acute inflammation. The receptors of histamine is also involved in acute inflammatory reaction .
