How do we sense temperature?
<p>One of my favourite things to learn in high school chemistry was how temperature worked—the average kinetic energy of substances being responsible for how hot or cold we might feel something to be. This was simple enough. Fast molecules that bump a lot = hotter. Slow molecules that don’t bump as often = colder. But that doesn’t exactly explain how our brain can sense and relay information about the temperature of a substance. When you pick up an ice cube, how does your brain know what you're touching is cold? How do we turn that measure of kinetic energy into signals that we can regularly identify as cold?</p>
<p>That’s what I’m aiming to explain today, and having taken a course in cellular and molecular biology, this has only just started to make sense to me.</p>
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