Ibala lolusu lwabantu kuxhomekeke koko? melanin

Abantu abafani: abamnyama, abamhlophe, amfusa, ethabathela nokukhanya mnyama. Ulusu umbala iyahluka amazwekazi kwilizwekazi. Uzizuze phi kule yantlukwano? Yintoni kugqiba umbala ulusu womntu? Yintoni na melanin? Kodwa nantsi eyona nyaniso.

Bala lintsundu. Yintoni na?

Ukuba sithethe koko bala lintsundu amagama - kombala ukuba kuhlelwe kwizisele isikhumba ekuthiwa melanocytes. I wonder into ekhoyo kwi isambuku izilwanyana, kuquka abantu. Inika isikhumba mbala bala lintsundu ezahlukahlukeneyo abangasekhoyo. Oku kuhlelwe ngeendlela ezimbini ezinkulu, umbala apho ziyahluka ukusuka mthubi ukuya mnyama brown namnyama. Eumelanin - luhlobo bala lintsundu unika nolusu umbala omdaka. Ifom yesibini-bala lintsundu - pheomelanin, leyo kumhlophe-mdaka. abantu ngenxa pheomelanin babe amabala okanye iinwele ezibomvu olenyayo.

Namhlanje, imfuza malunga uyazi phantse nabani. Ngamnye kuthi ilifa kubazali bakhe iseti zofuzo, kubandakanywa nabo banoxanduva ibala lolusu lwabantu. Zofuzo esebenzayo ngaphezulu iiseli, lo mnyama umbala ulusu. Hayi kudala kwenzeka ukuba bagcine ityala ekhethekileyo usapho olunye, leyo wazala amawele kunye imibala yebala. Kodwa iphenjelelwa yimiba yangaphandle ukongeza yofuzo ukuya kwimveliso-bala lintsundu.

Ifuthe bala lintsundu kwabantu

Wonke umntu kule planethi kalukhuni, ndoxelelwa ngubani inani elifanayo melanocytes. Oku kubonisa ukuba bonke abantu emhlabeni, nokuba ngabantu abamhlophe ngebala okanye amabhinqa amnyama ulusu efanayo. Lo mbuzo ubangelwa kwi Yindibanisela eziphilayo bala lintsundu ngamnye ezinye izinto zangaphandle. Ngenxa yempembelelo ultraviolet radiation yesikhumba yabantu iqalisa ukuvelisa melanin ngakumbi. Oku kunceda ukuthintela umonakalo DNA eluswini womntu.

De kube ngoku, le nkqubo ayikhange aphandwa ekupheleni, kodwa ulusu wethu yonakele ngenxa abasabela zikhusela eziphilayo. Abantu abahlala kufutshane ikhweyitha, apho imitha yelanga lokutshisa mercilessly, isikhumba waba umbala kwayo emnyama.

Programme Ukwehluleka

Kodwa ke ngelishwa, kwimigaqo, kukho ngaphandle. Namhlanje singakwazi ligcine isifo ezinqabileyo - albino. Lubonakala ngokungabikho bala lintsundu kweeseli zolusu. Le nkqubo yathi kuzo zombini izilwanyana kunye nabantu. Sasikuthanda esalusa ezi zilwanyana njengekhephu-ezimhlophe, umzekelo, uyakwazi ukubona ingonyama omhlophe , okanye zobungangamela ipikoko emhlophe, kodwa ukuba kuyenzeka ukuba umntu, oko ngokwenene ntlekele. Umntu akanakuba ixesha elide ilanga, nesikhumba sayo utshisa nangoko. Lisifa nokubhenca kakhulu.

Kukho ukusilela ngakumbi ikhowudi yezofuzo ebangelwe ilahleko okuqhubekayo melanocytes - vitiligo. Kulo mzekelo, isikhumba uba enemibala. Enoba umntu ibala okanye elaye loyisa ngayo kwesi sifo ngayo ngamanye amaxesha iba emhlophe ngokupheleleyo. Ngenxa yoko, indoda emnyama ngebala kwindalo mhlophe ngokupheleleyo. Ngelishwa, ugqwidizo genetic akanakunyangwa namhlanje.

abemi Light ngebala le planethi

An into umdla kukuba abameli abelungu enza ama-40% abo bonke abantu. Njengokuba besesitshilo, na umbala zemfuza ukukhanya ulusu lomntu kubangelwa umsebenzi-bala lintsundu izisele. Ukuba sicinga ukuba ihlawulwe kubantu umhlaba zijongene ngqo kwiqela elithile iimpawu yobuso kunye umbala dermis, bandule kwexesha Ukuqhela qela yakhokelela ekwakhiweni yohlanga ukukhanya ngebala. Ubuninzi aba bantu bahlala eYurophu, Asia kunye naseMntla Afrika.

Ibala lolusu lwabantu, njengoko sele kuchaziwe, naye nexhomekeke ngaphandle kweli. Umzekelo, kuMntla Yurophu, abantu dermis elula ngaphezu Asia. imitha yelanga abangathathi esebenzayo ngasentla, ngoko ke abantu abamhlophe lula ukufumana umzimba kufuneka kube novithamini D. Nangona kufanele kuphawulwe ukuba kukho abantu emantla abo ulusu emnyama ngokwaneleyo. Ngokutsho imibono wenzululwazi, oko kuxhomekeke ukutya.

Okubangel 'umdla kukuba, abantu ngesikhumba bala lintsundu fair kwiingcamba aphezulu sangaphandle ekhoyo kwimibhalo elinye. Iliso umbala kwakhona ixhomekeke yintoni inwebu iris kubekwe isixa esikhulu-bala lintsundu. Ukuba lo maleko wokuqala, amehlo aya kuba mdaka, yaye ukuba ezine okanye ezintlanu maleko, ukuze, ngokufanelekileyo, oluhlaza, okanye oluhlaza.

abantu abantsundu ngebala

Inani labemi engundoqo ukuba amnyama, abahlala Central kunye eMzantsi Afrika. Abantu kule kwizowuni zemozulu zixhomekeke elangeni obukhulu. Kodwa sesichengeni sosasazeko lwemitha yelanga emzimbeni womntu ebangela njini bala lintsundu ene-zikhusela. Isiphumo sesichengeni rhoqo elangeni yaba nesikhumba emnyama.

A isici esasenza kwinqanaba sofuzo abantu eluswini black kukuba iiseli zabo kuvelisa bala lintsundu ezininzi. Ngaphezu koko, njengoko abaphandi bafumanisa, umaleko aphezulu sangaphandle bantu lugubungela ngokupheleleyo kombala esikhumbeni. Le nto inika isikhumba umbala omdaka ukuya phantse abamnyama.

An into umdla kombala melanin kubonakala ebantwini nangoku kuphuhliso osandul. Kodwa mzuzu melanocytes ukuzalwa phantse shwaka usana umzimba, baze emva kokubeleka, ziqala ukukhula ngokukhawuleza esikhumbeni. Abantu abaninzi bayamangaliswa xa bebona ukukhanya kwi ebumnyameni ngebala kids mama. Into yokuba abantwana bazalwa zigwangqa kwaye ubumnyama phezu kwiinyanga ezimbalwa ezizayo.

Kwaye ekugqibeleni,

Ngeli xesha, isayensi bakucaphukele into yokuba umntu ibala - sisiphumo nolwamkelo iqela elithile labantu ukuba ubunzulu radiation elanga kuloo ndawo ahlala yazo. Bala lintsundu kulo mzekelo inikezela imisebenzi wokukhuselwa imitha yelanga ukusuka ilanga, xa kungekho ulusu bakhe dryahlela ngokukhawuleza kakhulu. Ukongeza nokuguga, kwenyusa amathuba nomhlaza wesikhumba.

Okubangel 'umdla kukuba abasetyhini ulusu elula kancinane kunamadoda. Yiloo nto amantombazana abamnyama khangela lubeka phi amakhwenkwe. Abantu dermis ukukhanya, le umahluko phantse okungenamsebenzi. Ngelishwa, kwihlabathi lanamhlanje ngayo umbala kaninzi kudala iingcinga. Icandelo loluntu kule rhoqo kukhokelela calulo ngokobuhlanga. Kodwa ke onke amalungu la zohlobo olufanayo yaye abantu.