Video: Peb yam dab tsi los txiav txim rau cov tawv nqaij?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Peb pigments pab txhawb rau cov tawv nqaij xim: melanin, carotene, thiab hemoglobin. Ntawm cov no, tsuas yog melanin yog tsim nyob rau hauv daim tawv nqaij.
Ib yam li ntawd, yam dab tsi tuaj yeem txiav txim siab ntawm daim tawv nqaij?
Melanin yog tsim tawm hauv tawv nqaij hauv cov hlwb hu ua melanocytes thiab nws yog lub hauv paus tseem ceeb ntawm tawv nqaij xim ntawm cov neeg tawv nqaij tawv. Cov tawv nqaij xim ntawm cov neeg nrog lub teeb tawv nqaij yog txiav txim siab Feem ntau los ntawm xiav-dawb cov ntaub so ntswg nyob rau hauv lub dermis thiab hemoglobin circulating nyob rau hauv cov hlab ntsha ntawm lub dermis.
Kuj Paub, uas chromosome txiav txim rau cov tawv nqaij xim? MC1R noob muab cov lus qhia rau kev ua cov protein hu ua melanocortin 1 receptor. Qhov receptor no ua lub luag haujlwm tseem ceeb hauv cov xim pigmentation. Tus neeg txais khoom feem ntau nyob ntawm qhov chaw ntawm melanocytes, uas yog cov hlwb tshwj xeeb uas tsim cov xim hu ua melanin.
Ua qhov no hauv kev txiav txim siab, yam dab tsi cuam tshuam rau daim ntawv xeem xim?
Ib puag ncig yam uas cuam tshuam cov xim ntawm daim tawv nqaij suav nrog ultraviolet lub teeb los ntawm qhov sib npaug lossis hnub ci thiab X duab hluav taws xob. Yuav ua li cas physiological yam cuam tshuam rau cov tawv nqaij xim ? Zoo oxygenated ntshav thiab dilated cov hlab ntsha redden lub tawv nqaij . Carotene tuaj yeem hloov pauv tawv nqaij daj daj.
Leej niam leej twg txiav txim xim tawv nqaij?
Cov qib ntawm melanin yog qhov tseem ceeb txiav txim siab los ntawm noob caj noob ces; cov neeg yug los rau cov tawv nqaij ncaj ncees niam txiv yuav txais lawv niam txiv ncaj ncees tawv nqaij , raws li cov tib neeg yug los rau cov tawv nqaij tawv niam txiv yuav tau txais koob hmoov tawv nqaij . Qib ntawm kev ua tau zoo tawv nqaij pigmentation yog hu ua constitutive pigmentation.
Pom zoo:
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Peb yam tseem ceeb ntawm kev txiav txim siab kho mob yog dab tsi?
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Puas yog lo lus dav dav txhais tau tias yog mob ntawm daim tawv nqaij lossis pob khaus uas tuaj yeem muaj ntau yam ua rau nws yog ib qho cim ntawm ntau hom tawv nqaij tsis xws luag?
Dermatitis yog lo lus dav dav uas piav txog kev ua rau tawv nqaij. Dermatitis yog ib yam mob uas muaj ntau yam ua rau thiab tshwm sim ntau yam. Nws feem ntau yog khaus, tawv nqaij qhuav los yog pob khaus ntawm daim tawv nqaij o, reddened
Daim ntawv teev npe twg piav txog plaub qhov chaw uas tus kws kho mob yuav txiav txim siab siv plaub lub ntsiab lus mus rau kev txiav txim siab ncaj ncees?
Nyob rau hauv lub moj khaum no, tag nrho cov teeb meem kev ncaj ncees raug tshuaj xyuas nyob rau hauv cov ntsiab lus ntawm plaub lub ntsiab lus: kev kho mob, kev nyiam ntawm tus neeg mob, lub neej zoo, thiab cov yam ntxwv ntawm cov ntsiab lus (piv txwv li, kev sib raug zoo, kev lag luam, kev cai lij choj, thiab kev tswj hwm)
Dab tsi txiav txim siab xim ntawm daim tawv nqaij xeem ntawv?
Peb yam kev mob lub cev uas cuam tshuam rau xim tawv nqaij yog: ntim cov ntshav hauv cov hlab ntsha hauv lub cev, carotene hauv txheej txheej tawv nqaij, thiab ntau yam kab mob. keratinized heev thaum lawv tuag vim tsis muaj ntshav txaus. Cov leeg nqaij arrector pili yog tsim los ntawm cov leeg nqaij striated