Video: Lub luag haujlwm tseem ceeb ntawm melanin yog dab tsi?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Melanin yog ib qho pigment uas muab cov xim ntawm daim tawv nqaij. Qhov no melanin yog tsim los ntawm thiaj li hu ua melanocytes nyob rau hauv daim tawv nqaij. Melanin yog lub cev tus kheej txoj hauv kev los tiv thaiv daim tawv nqaij tiv tshav ntuj. Cov txheej txheem ua tau zoo nqus tau UV-lub teeb thiab ua kom tsis muaj zog ua rau cov molecules (radicals) tsim los ntawm kev raug tshav ntuj.
Yog li ntawd, dab tsi yog qhov muaj nuj nqi ntawm cov protein melanin?
Melanin yog cov xim uas tsim tawm hauv cov xim tawv nqaij uas pab tiv thaiv cov cell los ntawm cov kab mob UV ua rau mob qog noj ntshav. Cov hlwb tshwj xeeb hu ua melanocytes tsim cov melanin, uas tom qab ntawd thauj mus rau lwm cov kab mob epidermal (hu ua keratinocytes) uas ua rau feem ntau ntawm tawv nqaij.
Ib yam li ntawd, tsim melanin li cas? Melanin yog ua dhau los ntawm cov txheej txheem tshuaj ntau dhau hu ua melanogenesis, qhov twg oxidation ntawm cov amino acid tyrosine tau ua raws li polymerization. Cov melanin pigments yog ua hauv ib pawg tshwj xeeb ntawm cov hlwb hu ua melanocytes.
Tsis tas li, dab tsi yog lub luag haujlwm tseem ceeb ntawm melanin quizlet?
Melanin muab tawv nqaij xim thiab nqus tau hluav taws xob los ntawm teeb UV.
Lub hom phiaj ntawm melanocytes yog dab tsi?
Melanocytes yog cov hlwb ntawm neural crest keeb kwm. Hauv tib neeg daim tawv nqaij, lawv tsim kev sib raug zoo nrog keratinocytes los ntawm lawv cov dendrites. Melanocytes tau paub zoo txog lawv lub luag haujlwm hauv daim tawv nqaij xim, thiab lawv lub peev xwm los tsim thiab faib cov melanin tau kawm ntau yam.
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