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The physical structure of the skin: skin adults about 1.5-2.0 meters, is the body’s largest organ. Skin into the epidermis, dermis, subcutaneous tissue three, skin metabolism cycle is 28-45 days. Normal skin is acidic.
Skin features: skin protection, secretion, excretion, thermostat, immune, absorption, feeling, visceral reaction physiological function problems.Pigment contained in the human body: skin color pigment composed by four creatures: the black-brown pigment, red oxygen
Co-heme, blue and yellow carotene heme reduction, skin color is mainly determined by the melanocytes.
Composition melanin system: the system has melanin in melanocytes melanosomes, melanin and tyrosinase formed, this system is dynamic exists. Highly sensitive to endogenous and exogenous stimuli that produce pigment
Or depigmentation. Melanoma cells mainly in the basal layer and hair bulb, there are also a number of melanocytes in the dermis, interspersed between collagen fibers and elastic fibers. Factors that affect the skin color change: genes, hormones (melanocyte-stimulating hormone, estrogen, etc.), the sun, the ultraviolet rays causes skin pigmentation after 48 hours.
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