how our body respond to Hot and Cold object when touched
Answers
The human body senses temperature changes through specialized nerve endings called thermoreceptors, located just beneath the skin. These receptors are distributed throughout the body and are constantly transmitting temperature information to the brain. A decrease in temperature activates cold receptors, and an increase activates warm receptors. Thermoreceptors can also respond to specific chemicals. For example, menthol activates cold receptors, which explains the chilling sensation you might feel after brushing your teeth or using an analgesic cream. Capsaicin, a chemical found in chili peppers, has been shown to activate warm receptors, causing the familiar red-hot burning and sweating reaction that accompanies a spicy meal.
Cold receptors primarily react to temperatures ranging from 68 to 86˚F, while warm receptors are activated between 86˚F and 104˚F. At extreme temperatures—below 60˚F and beyond 113˚F—the temperature signal is accompanied by a sensation of pain. Weirdly, researchers have discovered that at temperatures greater than 113˚F, some cold receptors can also fire. This phenomenon, known as paradoxical cold, has puzzled scientists for decades. No one is quite sure why the effect happens, since it doesn't seem to offer an evolutionary or adaptive benefit, says Barry Green, director of the John B. Pierce Laboratory and professor of surgery at Yale University School of Medicine. Today researchers are considering a wide array of interpretations of the strange sensation.
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