Amadoda yiwona kuphela ama-primates anezinwele ezinhle kangaka, ezinde, nezimibalabala. Akukhona ngengozi: ukuba khona kwabo kufakazela izinzuzo ezithile ezitholwe ngesikhathi sokuthuthuka.

Ngakho, i-melanin pigments, equkethwe yizinwele futhi enesibopho sombala wayo, iyakwazi ukunciphisa ubuthi nezinsimbi ezisindayo, okube yinzuzo ikakhulukazi kubantu abadla izinhlanzi eziningi (izinhlobo eziqoqa imfucumfucu enobuthi phakathi nempilo yazo)1.

Ngaphezu kwalokho, izinwele ezimnyama, ezithinta u-90% wabantu emhlabeni, zivikela ukushiswa yilanga kanti i-melanin yayo isiza ukwakha ibhalansi eyanele ye-hydrosaline (okusho ukulawulwa kahle kwamanzi nosawoti emzimbeni. Inhlangano).

Ngabe lo mbala uncike kuphi?

Ukuze siqonde ukuthi umbala wezinwele zethu uvelaphi, kumelwe sibhekisise indawo lapho izinwele ziphuma khona: isibani sezinwele.

Lokhu kwenziwa ngamaseli amabili abaluleke kakhulu ahlukene: i-keratinocyte kanye ne- melanocyte.

Eyokuqala izokwakha i-eksisi yezinwele ngemuva kokwenza impahla yazo eluhlaza, i-keratin. Ama-melanocyte, amancane kakhulu, azogxila ekukhiqizeni ama-pigment (anemibala ngencazelo) azowadlulisela kuma-keratinocytes ezinwele2. Lezi mibala ze-melanin zihlukile komunye nomunye, ukuze ukwakheka kwazo kunqume umbala wezinwele zomuntu ngamunye (blond, brown, chestnut, red…). Ukuhlinzwa, okudingekayo ekudaleni izinwele, kuyaqhubeka phakathi nomjikelezo wakudala wezinwele, okusho ukuthi ngesikhathi sokukhula kwawo (1 cm ngenyanga iminyaka emi-3 kuye kwemi-5 kuye ngobulili.3) kuze kube ukuwohloka kwayo okuzoholela ekuwa. Enye inwele bese ithatha indawo yayo bese kuqhubeka ukusebenza. Kuze kube usuku lapho lo mshini ubonakala sengathi ujimele.