UMary Allen
Isikhumba siyisitho somzimba, ezilwaneni nakubantu. Imboza ingaphandle lomzimba. Njengegobolondo, lisivikela ekulimaleni nakumabhaktheriya. Inesisindo esingaphezu kwanoma yisiphi esinye isitho. Kumuntu omdala, icishe ibe ngamamitha-skwele amabili ngosayizi.
Isikhumba sethu sinesikhumba sangaphandle esincanyana, esibizwa nangokuthi ungqimba olunezimpondo noma i-epidermis. Yakhiwe ngamangqamuzana afile. Ngaphansi kunesikhumba sesikhumba, i-dermis. Ku-dermis kunemizwa nemithambo yegazi. Izimpande zezinwele kanye nezindlala zokujuluka kanye ne-sebum nazo zitholakala lapho. I-sebum iqinisekisa ukuthi isikhumba asomi.
Esikhumbeni kukhona odayi abancane ababizwa ngama-pigments? Abantu abanebala elimnyama banebala eliningi. Lapho ilanga likhanya esikhumbeni, lenza umbala owengeziwe. Lokhu kwenza isikhumba sibe mnyama futhi sivikeleke kangcono elangeni. Ngakolunye uhlangothi, abantu abanebala elimhlophe bashiswa ilanga kalula. Abanye abantu nezilwane abanaso nhlobo umbala. Kubizwa nge-albinism.