Hudens uppbyggnad

Huden är vårt största organ, nästan 2 kvadratmeter stor och väger i snitt 3 kg hos en vuxen kvinna. Den är en viktig del av vårt immunförsvar, en yttre barriär som ska skydda resten av kroppen mot fysisk skada, oxidation, uttorkning, skadliga ämnen och mikroorganismer. Dessutom reglerar huden vår kroppstemperatur, innehåller en av de viktigaste fettdepåerna och är hemvist för ett av våra fem sinnen, känseln. I talgkörtlarna bildas antioxidanten E-vitamin och som skydd mot UV-strålning bildar huden melanin – vårt eget solskydd och pigment. I huden bildas och frisläpps även feromoner, ett hormonliknande signalämne som omedvetet kan registreras av andra människor (framförallt motsatta könet). Huden fungerar även som ett endokrint organ genom att med hjälp av solljus omvandla kolesterol till D-vitamin, ett viktigt sk prohormon med en rad olika funktioner.

Huden består av tre lager: överhud (epidermis), läderhud (dermis) och underhud (hypodermis). Den innehåller även andra organ som t ex svettkörtlar, talgkörtlar, hår och naglar. För att kunna förstå hur hudvårdsprodukter kan påverka huden krävs att man har en viss kunskap om dessa olika lager.


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