I-melanocyte uhlobo lensili olutholakala ngokuyinhloko emgqeni osisekelo we- epidermis . Ama-melanocytes akhiqiza i-melanin, i-pigment enombala obomvu obangela umbala wesikhumba nokuvikela emiphumeleni eyingozi yokukhanya kwe-UV. Ama-melanocytes nawo akhona ezinwele nasezintweni zamehlo.
I-Makeup of Melanocytes
Ama-melanocytes akhula ngaphakathi kwe-neural crest: iqembu lesikhashana lamangqamuzana e-embryonic atholakala njenge-tube ye-neural-noma ama-pre-spinal-form forms.
Ngesikhathi sesibindi sokuphila, ama-melanocytes asuka e-neural crest eya ku-basal ungqimba we-epidermis. Ama-melanocyte afana nesigatshana, okuvumela ukuba badlulisele i-melanin kwamanye amaseli esikhumba, njenge- keratinocytes . I-Keratinocytes yilezi zitho zesikhumba ezivame kakhulu eziqinisa izinwele, izipikili, nesikhumba.
Ukukhiqiza
Ama-melanocytes akhiqiza i-melanin, efika emangqamuzaneni e-epidermal. Kunezinhlobo ezimbili ezahlukene ze-melanin ukuthi ama-melanocytes akhiqiza: i-eumelanin, enombala omnyama ombala, ne-phaeomelanin, engaba nombala obomvu noma ophuzi.
Ukukhiqizwa kwe-Melanin kulawulwa i-hormone ye-peptide ekhonjeni le-pituitary futhi eyaziwa ngokuthi i-hormonecyte-evuselela i-hormone. Izicubu ze-pituitary kanye namazinga e-estrogen e-spiked ayenzeka ngesikhathi sokukhulelwa enza ukuthi i-pituitary gland ikhiqize okuningi kwaleli hormone.
Kodwa ama-melanocytes awasebenzi ngaso sonke isikhathi njengoba kufanele. I-Vitiligo, isibonelo, yisimiso sesikhumba esihlala kuyo lapho ama-melanocytes engavelisi khona i-melanin, okwenza kube nezikhwama zesikhumba ezimhlophe, ezinama-oval ezikhula kancane kancane.
Ukuntuleka kwe-melanin kubuye kuphendulele izinwele ezindaweni ezichaphazelekile ezimhlophe. Ezinye izimo ezithinteka ngokuntuleka kwe-melanin zihlanganisa ubu-albino kanye ne-phenylketonuria.
Ukubaluleka Kwe-Melanin
Umbala wesikhumba somuntu uhluka. Umthunzi wayo oqondile unqunywa igazi eligeleza kulo, ukudla, kanye ne-melanin eyenziwa ama-melanocytes.
Abantu ngokuvamile banesilinganiso esifanayo sama-melanocyte; inani le-melanin ukuthi lezo zakhiwe zakhiqiza, kodwa yilokho okuhlukahluka.
I-Melanin ivikela isikhumba ngokuyivikela kusukela elangeni. Lapho isikhumba sibheke elangeni, ukukhiqizwa kwe-melanin kwanda, yilokho okukhiqiza i-tan. Yindlela yokuzivikela yemvelo yomzimba ngokumelene nokushisa kwelanga.
Isikhathi eSangeni Siza Ngezindleko
Wonke umuntu ubheka kangcono ngokukhanya, kodwa kuza ngezindleko. Ukuchitha isikhathi esiningi elangeni (noma embhedeni wokuthumba) kuyingozi. Thatha ukushisa kwelanga, isibonelo. Kuthatha isikhathi sokuba ama-melanocytes akhiqize i-melanin futhi avikele isikhumba emisebeni yelanga eliyingozi. Lapho ama-melanocyte engakwazi ukusebenza ngokushesha ngokwanele ukwenza i-tan, ama-ray e-UV avela elangeni angashisa isikhumba futhi ashiye i-pink ebonakalayo noma ebomvu. Ukulimala kwelanga nakho kuqoqa ngokuhamba kwesikhathi, okungabangela umdlavuza wesikhumba. Ukukhanyisa isikhumba sakho, ingozi enkulu yokuthuthukisa umdlavuza wesikhumba. Ngakho qiniseka ukuthi ubona i-dermatologist njalo ukuhlolwa kwesikhumba.
Ukukhanya kwelanga akuyona yonke into embi, noma kunjalo. Isikhumba sisebenzisa ilanga ukuze senze i-vitamin D, esithatha i-calcium futhi ibalulekile ekutheni amandla namathambo akhule.