It's going to be summer, and it's going to be a sweaty day. So why do people sweat? People's body temperature is constant, generally maintained at about 37 ℃, controlled by the temperature regulation center in the nervous system, so that the body heat production and heat dissipation maintain a relative balance.
Why does the human body sweat? What are the benefits of sweating?
When people eat food, part of the energy released by digestion and absorption is transformed into people's work activities, and part of it radiates out in the form of heat. Through the heat dissipation process, the body can maintain a certain temperature. Skin is the main channel of heat dissipation.
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When the external temperature is lower than the skin temperature, radiation, conduction and convection are the main ways of heat dissipation; when the external temperature is higher than the skin temperature (33 ℃), sweating becomes the main way of heat dissipation. In summer, the temperature is often above 30 ℃, sometimes as high as 38 ℃. Sweating becomes the main or only way of heat dissipation. As a result, people sweat the most in summer.
Sweat is a kind of thin liquid secreted by sweat glands. Heat stimulation stimulates sweat glands to secrete sweat. In addition, such as emotional stress, drinking too much water, physical activity (sports or labor) large, can also stimulate sweat gland secretion. Sweat gland activity is mainly to regulate body temperature, followed by excretion. When a large amount of perspiration occurs, the sweat drops or is wiped dry, and the heat dissipation effect is poor; if the sweat is left on the surface of the skin and gradually evaporates, it has a better heat dissipation effect.
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