Maza ne kawai primates da suke da irin wannan gashi mai kyau, dogo, da launi. Ba kwatsam ba: kasancewar su yana tabbatar da wasu fa'idodin da aka samu yayin haɓakawa.

Saboda haka, melanin pigments, ƙunshi a cikin gashi kuma alhakin launi, suna iya kawar da gubobi da kuma nauyi karafa, wanda ya kasance da amfani musamman ga mutanen da suke cin kifi da yawa (nau'in da tara mai guba a lokacin rayuwarsu).1.

Bugu da ƙari, gashi mai duhu, wanda ya shafi kashi 90% na al'ummar duniya, yana kare kariya daga kunar rana kuma melanin yana taimakawa wajen tabbatar da isasshen ma'aunin hydrosaline (watau kyakkyawan tsari na ruwa da gishiri a cikin jiki. kungiyar).

Menene wannan launi ya dogara da shi?

Don fahimtar inda launin gashin mu ya fito, dole ne mu yi la'akari da wurin da gashin ya fito: kwan fitila.

Wannan ya ƙunshi sel guda biyu masu mahimmanci daban-daban: keratinocytes da keratinocytes karanciln.

Na farko zai zama axis na gashi bayan sun ƙera albarkatun su, keratin. Melanocytes, ƙananan yawa, za su mayar da hankali ga samar da pigments (launi ta ma'anar) wanda za su watsa zuwa keratinocytes na gashi.2. Wadannan pigments na melanin sun bambanta da mutum ɗaya zuwa wani, ta yadda tsarin su zai ƙayyade launin gashin kowane mutum (bland, brown, chestnut, ja ...). Aiki, wanda ya zama dole don canza launin gashi, yana ci gaba a lokacin yanayin yanayin gashi, wato lokacin girma (1 cm kowace wata don shekaru 3 zuwa 5 dangane da jima'i).3) har zuwa lalacewarsa wanda zai kai ga faduwa. Wani gashi kuma ya dauki wurinsa aka cigaba da aikin. Har zuwa ranar da ake ganin na'urar ta cika.