d. If you touch something hot, you are suggested to dip your hand in cold
present in water.
water. Why?
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When you put your hands into the medium temperature water, the hand that's been in the cold water feels warmer while the one that was in the warm water feels cold.
Your hands get desensitized to the sub-zero cold, your brain doesn't register anymore how cold they actually are. Flowing cold water is always warmer than the outside freezing air and is thus perceived as warm or even hot by your brain.
Cutaneous receptors stimulated by ice-water immersion of one hand will increase sympathetic nerve activity to the palm skin in the nonimmersed contralateral hand and reduce blood flow, reflecting on a decrease in skin surface temperature under a constant ambient environment.
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