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Maqaarkaagu waa xubinta ugu weyn ee jidhkaaga wuxuuna u shaqeeyaa sidii difaac. Waxay dabooshaa jirkaaga oo dhan waxayna leedahay bedka sare ee ku dhawaad 21.5 feet oo laba jibbaaran (2 mitir oo laba jibbaaran).
Dhumucdiisu waxay u dhaxaysaa 0.02 inch (0.5 millimeter) daboolka indhahaaga ilaa 0.16 inch (4 milimitir) ama in ka badan meelaha “adag”, sida calaacalaha gacmahaaga iyo cagahaaga. Wadar ahaan, waxay ka dhigan tahay qiyaastii 16 boqolkiiba miisaanka jidhkaaga. Maqaarkaagu wuxuu ka ilaaliyaa xubnahaaga gudaha caabuqa wuxuuna caawiyaa xakameynta heerkulka jirka .
Maqaarkaagu wuxuu ka kooban yahay saddex lakab oo waaweyn. Lakabka sare, oo loo yaqaan epidermis , wuxuu ka kooban yahay unugyada maqaarka, midab, iyo borotiinno. Lakabka dhexe, oo loo yaqaanno maqaarka , wuxuu ka kooban yahay xididdada dhiigga, neerfayaasha, timaha xaadda ah, iyo qanjidhada saliidda, waxayna siisaa nafaqooyinka epidermis. Lakabka ka hooseeya maqaarka, oo loo yaqaan lakabka subcutaneous , wuxuu ka kooban yahay qanjidhada dhididka, timaha qaarkood, xididdada dhiigga, iyo baruur. Lakab kastaa wuxuu kaloo ka kooban yahay unug isku xiranoo leh fiilooyinka kolajka si ay u bixiyaan taageero iyo fiilooyinka elastin si ay u bixiyaan dabacsanaan iyo xoog. Unugyada lakabka hoose ee epidermis kaaga ayaa si joogto ah u kala qaybsan si ay u sameeyaan unugyo cusub, iyagoo siinaya maqaarkaaga jaakad balaaran, kaas oo unugyada qoto dheer ka ilaaliya dhaawaca, caabuqa, iyo qallaylka. Unugyada dusha sare ee epidermis kaaga way dillaacaan waxaana si joogto ah loogu beddelaa kuwo cusub, si 30kii maalmoodba uu jidhkaagu u soo saaro qayb cusub oo maqaarka ah. Jirka bini’aadamku wuxuu daadiyaa qiyaastii 600,000 oo qayb oo maqaarka ah saacad kasta – taasi waa qiyaastii 1.5 rodol (0.68 kiiloogaraam) sannadkii. Markay gaadho da’da 70, celceliska bini’aadamku wuxuu lumin doonaa 105 rodol (47.6 kiiloogaraam) oo maqaarka ah.