![Cov pigments pom nyob qhov twg hauv cov pas nrig thiab lub khob hliav qab? Cov pigments pom nyob qhov twg hauv cov pas nrig thiab lub khob hliav qab?](https://i.answers-medical.com/preview/medical-health/13918537-where-are-the-visual-pigments-located-in-the-rods-and-cones-j.webp)
Video: Cov pigments pom nyob qhov twg hauv cov pas nrig thiab lub khob hliav qab?
![Video: Cov pigments pom nyob qhov twg hauv cov pas nrig thiab lub khob hliav qab? Video: Cov pigments pom nyob qhov twg hauv cov pas nrig thiab lub khob hliav qab?](https://i.ytimg.com/vi/8A88zIHfDR0/hqdefault.jpg)
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Anatomy ntawm pas nrig thiab cones nws txawv me ntsis. Rod thiab lub khob hliav qab photoreceptors yog pom nyob rau txheej txheej sab nrauv ntawm retina; lawv ob leeg muaj cov qauv yooj yim tib yam.
Tsis tas li ntawd, dab tsi yog cov xim pom pom hauv pas nrig?
Rhodopsin yog lom pom xim hauv pas nrig ntawm retina thiab yog G-protein-coupled receptor (GPCR). Nws belongs rau opsins. Rhodopsin yog qhov rhiab heev rau lub teeb, thiab yog li ua rau pom kev hauv qhov xwm txheej qis.
cov pas nrig thiab lub khob nyob qhov twg? Cov pas nrig thiab cones yog cov hlwb photoreceptive ntawm cov retina, nyob tom qab qhov muag . Cov Lub khob hliav qab cov cell yog lub luag haujlwm rau lub zeem muag xim, thiab feem ntau ntom nyob hauv nruab nrab ntawm cov retina, thaj chaw hu ua fovea.
Yog li ntawd, dab tsi yog cov xim pom thiab lawv pom nyob qhov twg?
Ntau cov tsiaj txhu muaj ob lossis ntau dua pom cov xim . Scotopsin cov xim tau cuam tshuam nrog kev pom kev hauv qhov pom kev tsis pom kev, thiab hauv vertebrates, yog pom nyob rau hauv cov qia hlwb ntawm retina; lub retinal1 cov ntaub ntawv raug hu ua rhodopsins, thiab retinal2 tsim cov porphyropsins.
Dab tsi yog qhov pom xim ua los ntawm?
Pom cov xim yog ib qho tseem ceeb ntawm cov protein hu ua opsins uas suav nrog apo-opsin thiab muaj lub teeb pom kev zoo thoob plaws lub cev, ua rau lub paj hlwb (daim duab 38.8). Retinal nyob hauv chav kawm ntawm cov molecules hu ua retinoids uas tseem suav nrog cov vitamin A (all-trans-retinol).
Pom zoo:
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Cov hlwb qws yog cov hlwb photoreceptor nyob rau hauv lub qhov muag ntawm lub qhov muag uas tuaj yeem ua haujlwm hauv lub teeb qis dua li lwm hom kev pom lub ntsej muag photoreceptor, lub khob hliav qab. Cov pas nrig feem ntau pom muaj qhov sib luag ntawm cov ntug sab nrauv ntawm cov retina thiab tau siv hauv qhov muag pom ib puag ncig
Qhov twg ntawm cov hauv qab no yog qhov sib txawv loj ntawm cov pas nrig thiab lub khob hliav qab?
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Cov pas nrig yog lub luag haujlwm rau qhov pom ntawm qhov tsis pom kev qis (scotopic vision). Lawv tsis kho qhov muag pom xim, thiab muaj qhov tsis tshua pom kev zoo. Cones yog nquag nyob rau theem siab dua (photopic vision), muaj peev xwm ntawm kev pom xim thiab muaj lub luag haujlwm rau siab spatial acuity
Dab tsi yog cov qauv pom hauv lub qhov muag yaj uas tsis pom nyob hauv tib neeg qhov muag?
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Lub tapetum lucidum, uas tsis pom nyob rau hauv tib neeg lub qhov muag, ua haujlwm kom pom lub teeb mus rau retina
Koj paub li cas yog tias koj muaj 4 lub khob hliav qab?
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Lub khob thib plaub, piav raws li "daj" yog qhov nkag siab tshaj plaws rau daj-ntsuab. Ib txoj hauv kev los qhia yog muaj tus kws kho qhov muag saib ntawm qhov pom ntawm koj lub khob hliav qab. Tsis muaj coob tus tuaj yeem ua qhov no thiab nws tsis qhia koj yog tias lawv tau txuas nrog txoj hauv kev uas cov ntaub ntawv tau txais rau koj lub hlwb
Cov pas nrig thiab lub khob hliav qab pom lub teeb li cas?
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Lub retina kuj muaj cov hlab ntsha uas qhia lub hlwb seb cov photoreceptors yog 'pom.' Muaj ob hom photoreceptors koom nrog hauv kev pom: rods thiab cones. Qws ua haujlwm ntawm qib qis heev. Cones xav tau ntau lub teeb thiab lawv siv los saib xim