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Why do people feel the heat and cold
 
     When it gets hot in the nerves in the skin of the person shall notify the brain. Moss gives the signal to the sweat glands start to work. The human body is cooled by 3 million sweat glands. Each sweat gland is similar to the micro pump which pumps water from the surrounding capillaries, and delivering to the skin, thereby cooling it. Since our body is 60% water, sweat glands resemble the well, connecting with a huge ocean.
There are two types of sweat glands: eccrine and apocrine. Eccrine glands are specifically designed to cool the body and are able to allocate up to 2 liters of water per hour when a person experiences intense physical nagruzki.Rabota apocrine glands are not stimulated by the warmth and emotional experiences. These glands secrete sweat in the hair follicles armpits, groin and nipples. where it is mixed with bacteria and fat, which gives color perspiration and odor. When sweat evaporates, the skin cools your body temperature drops.
When a person eats ice cream quickly, it can cause a painful sensation in the forehead, as if the brain is to "freeze". Cool product for the sky, the blood vessels constrict, trying to avoid heat loss. After the cessation of cooling the blood vessels dilate again, quickly restoring blood flow to the brain. It is this sudden influx causes headache. You can ease the pain quickly warmed their skies. To do this, press the top side of the sky to the language or the language of a rolled up into a tube, to press toward the sky underside of the language (it is warmer). Some help when they sip sip water at room temperature or warm pressed against the sky thumb.