Why does an rime pack burn?

When you use an ice pack on a sore fund or twisted ankle, at first it feels cold, after your skin feels close to it is burning, then go numb. Anyone know the medical reason for the burning sensation from a cold source? Skin have two types of cells for measure temperature: roast receptors and cold receptors. These are scattered over your in one piece body, but they're most heavily concentrated on your face, your most temperature-sensitive region. Your brain determines skin heat by counting how frequently these cold and heat receptors fire.
If you've ever spilled something greatly hot on yourself, you might have notice that it can feel strangely chilly in assimilation to painfully hot. This is because your cold receptors start firing at fundamentally high temperature, as well as your grill receptors. Likewise, if you touch something very cold, it might touch strangely hot as well. This is because spasm receptors are triggered by extreme cold, and these signals are easily confused next to heat.
If your skin's single a little hot or cold--but still essential eighty-six degrees--your receptors will stop firing and skin will get used to individual that temperature. Test this by wadding three bowls of water--make one warm, one cool, and one separating. Put one hand surrounded by the warm hose and the other in the cool, later leave them within. After they get used to these temperature, move them both to the middle bowl. Your hand from the cool wet will now perceive warm, while your foot from the warm hose will now grain cool!
something called Freezer burn.
I dream up that the water within the cells freeze and burst. When you are burned by boil, the water contained by the cells boil and burst. I guess that the inkling is the same because the cell devastate is the same.