Video: Dab tsi ua rau cov tshuaj tiv thaiv cortical?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov cov tshuaj tiv thaiv cortical yog ib txoj kev pib thaum lub sij hawm fertilization los ntawm kev tso tawm ntawm cortical granules los ntawm lub qe, uas tiv thaiv polyspermy, fusion ntawm ntau cov phev nrog ib lub qe.
Ua li no, dab tsi ua rau cortical granules tso?
Cortical granules yog organelles nyob rau hauv daim nyias nyias cortex ntawm oocytes unfertilized. Tom qab fertilization, cortical granules ua rau exocytosis tso tawm lawv cov ntsiab lus rau hauv qhov chaw perivitelline.
Dab tsi ua rau cov phev thib ob los ntawm kev nkag mus rau hauv ovum? Tom qab lub phev nkag cytoplasm ntawm oocyte (tseem hu ua ovocyte), tus Tsov tus tw thiab txheej sab nrauv ntawm phev disintegrate thiab cortical cov tshuaj tiv thaiv tshwm sim qhov chaw, tiv thaiv lwm yam phev los ntawm fertilizing tib yam qe . Cov phev nucleus ces fuses nrog cov ovum , ua kom muaj kev sib txuas ntawm lawv cov khoom siv caj ces.
Tom qab ntawd, cov lus nug cortical yog dab tsi?
Cov cov tshuaj tiv thaiv cortical yog exocytosis ntawm lub qe cortical granules. Cortical granules yog secretory vesicles uas nyob hauv qab lub qe lub plasma membrane. Qhov no ua rau fusion ntawm cortical granule daim nyias nyias nrog lub qe plasma membrane, liberating cov ntsiab lus ntawm granules mus rau qhov chaw extracellular.
Yuav ua li cas cortical granules tiv thaiv Polyspermy?
Txhawm rau tiv thaiv polyspermy , zona pellucida, tus qauv uas nyob ib puag ncig cov qe tsiaj, ua tsis tau zoo thaum fertilization, tiv thaiv qhov nkag ntawm cov phev ntxiv. Cov txheej txheem hloov pauv hauv zona thaum fertilization yog tsav los ntawm exocytosis ntawm cortical granules.
Pom zoo:
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