Video: Dab tsi yog ob Photopigments?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Photopigments ntawm vertebrate retina
Hauv kev kho mob cov ntsiab lus, lub sij hawm photopigment yog siv rau opsin-type photoreceptor proteins, tshwj xeeb tshaj yog rhodopsin thiab photopsins, photoreceptor proteins nyob rau hauv retinal rods thiab cones ntawm vertebrates uas yog lub luag hauj lwm rau kev pom kev pom, tab sis kuj melanopsin thiab lwm yam.
Kuj nug, ob hom photoreceptors yog dab tsi?
Muaj ob hom photoreceptors nyob rau hauv tib neeg retina, pas nrig thiab cones. 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.
Tsis tas li ntawd, dab tsi yog Photopigments hauv cones? Tsis zoo li cov pas nrig, cov ntu sab nraud ntawm Lub khob hliav qab muaj invaginations ntawm lawv cov cell membranes uas tsim pawg ntawm membranous disks. Photopigments muaj nyob raws li cov protein transmembrane hauv cov disks no, uas muab ntau qhov chaw rau lub teeb kom cuam tshuam rau cov xim.
Ib yam li ib tus tuaj yeem nug, cov pas nrig puas muaj Photopigments?
Tib neeg muaj plaub qhov sib txawv. Ib hom muaj nyob hauv rods thiab yog lub luag haujlwm rau lub teeb pom kev qis, thiab peb yam yog pom nyob rau hauv cones thiab subserve xim tsis pom kev los ntawm teb rau xiav, ntsuab, thiab liab wavelengths.
3 hom cones yog dab tsi?
Tib neeg lub qhov muag muaj ntau dua 100 lab tus pas nrig. Cones xav tau ntau lub teeb thiab lawv tau siv los saib xim. Peb muaj peb hom cones : xiav, ntsuab, thiab liab.
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