The main function of the skin is to protect, feel, regulate the temperature, secretion, excretion and absorption.
1, protection: skin is the outermost layer of human body, it can protect human body from external factors and prevent infiltration of water and chemicals and bacteria invasion.
2 sensory effects: the nerve endings of the cortex allow the skin to reflect cold, heat, pain, pressure and touch.
3 adjust the temperature effect: the human normal temperature is about 37 degrees centigrade. If the temperature is affected by the external temperature, the skin blood vessels and sweat glands will automatically adjust the body temperature.
4 secretory function: the sebaceous glands are secreted in full bloom to form dark sore, and the emotional instability can also affect the normal activity of the secretory gland.
5 excretory effect: perspiration is the normal excretion of the skin, and water, salt and other chemicals are discharged from the body when sweating.
6 absorption: the absorption of the skin is limited, and only a small amount of cosmetics can be absorbed into the body.
7 regenerative function: the regenerative function of the skin is very strong. If the surgical incision is usually healed after several days of operation.
8 other functions: skin is involved in the metabolism of the whole body. It is one of the main reservoirs in the human body. Most of the moisture is stored in the dermis, and its water content accounts for 18%--20% of the whole body.
Skin is also an important immune organ. Many infectious diseases such as vaccination, allergic reaction, diagnostic skin tests for some diseases, drug allergy tests and so on are all carried out through skin. In addition, the skin is an expression organ, the facial expression muscle contraction and relaxation affect the skin to produce various expressions, therefore, the facial skin's body and mind is particularly important for the expression.