While he probably wouldn’t win any prizes in the I work to support my wife’s cat addiction shirt, you wouldn’t imagine that this dude was high in the “deadly” stakes either. But see those glands behind the eyes. They contain a deadly poison that kills thousands of animals who think they are about the get an easy meal, and could kill you should you consume any. Low temperatures open channels in sensory neurones, ions begin to flow and a signal is sent to your brain, providing a sensation of “cold”.
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However, it is not just the cold that can open this I work to support my wife’s cat addiction shirt. Menthol also activates it. The mechanism is not completely known, but menthol clearly has the correct chemical structure to activate this response. Your neurones are triggered and a signal is sent to your brain. It is an identical signal to that of “cold” temperatures. So your brain is fooled into thinking the water you are drinking is colder than it is. The water merely increases the effect as it brings more menthol into contact with your neurones. This is virtually the same as eating spicy food. Except with spicy food you have the sensation of heat because of the way the neurones are stimulated.