Video: Nws hu li cas thaum lub xov tooj ntawm tes so hauv lub xeev?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Qhov zoo li qub membrane muaj peev xwm ntawm quiescent hlwb yog hu ua qhov so ntawm daim nyias nyias muaj peev xwm (los yog so qhov hluav taws xob), uas tsis yog qhov tshwj xeeb dynamic electrochemical phenomena hu ua muaj peev xwm ua tau thiab qib membrane muaj peev xwm.
Ib yam li ntawd, koj tuaj yeem nug, depolarization tshwm sim li cas?
Depolarization thiab hyperpolarization tshwm sim thaum ion channels hauv daim nyias nyias qhib lossis kaw, hloov lub peev xwm ntawm cov ions tshwj xeeb nkag mus lossis tawm ntawm lub cell. Kev qhib cov channel uas cia cov ions zoo ntws mus rau hauv lub cell tuaj yeem ua rau depolarization.
Kuj Paub, depolarization txhais li cas? Hauv biology, depolarization yog ib qho kev hloov hauv ib lub xovtooj ntawm tes, lub sijhawm uas lub xovtooj tau hloov pauv hauv cov nqi hluav taws xob, uas ua rau tsis zoo rau hauv lub cell. Depolarization Nws yog ib qho tseem ceeb rau kev ua haujlwm ntawm ntau lub hlwb, kev sib txuas lus ntawm cov hlwb, thiab tag nrho physiology ntawm lub cev.
Tom qab ntawd, dab tsi ua rau Afterhyperpolarization?
Lub peev xwm ua tau tshwm sim los ntawm qhov muaj peev xwm muab qhab nia uas ua rau lub membrane kom depolarize kom txog thaum nws ncav cuag qhov pib rau kev ua kom muaj zog-gated Na+ cov channel. Vm tom qab ntawd repolarizes, overshoots lub resting membrane peev xwm ( ua rau tus tom qab hyperpolarization ), raws li qhov voltage-gated K+ channels nyob qhib.
Puas yog tag nrho cov hlwb puas muaj peev xwm ua kom lub cev so?
Txhua lub hlwb hauv lub cev muaj tus yam ntxwv so membrane muaj peev xwm nyob ntawm lawv cell hom. Ntawm qhov tseem ceeb, txawm li cas los xij, yog cov neurons thiab tag nrho peb hom nqaij hlwb : smooth, skeletal, thiab cardiac.
Pom zoo:
Vim li cas lub xov tooj ntawm tes suav hais tias yog cov qauv tsim thiab kev ua haujlwm ntawm txhua yam kabmob?
Cell hu ua structural unit vim lub cev ntawm tag nrho cov kab mob yog tsim los ntawm cov hlwb. Nws yog lub luag haujlwm ntawm lub neej vim tias tag nrho cov haujlwm ntawm lub cev (physiological, biochemical. genetic thiab lwm yam haujlwm) yog ua los ntawm cov hlwb
Lub organelle twg ua haujlwm raws li qhov chaw xa ntawv ntawm lub xov tooj ntawm tes txheeb cov proteins thiab xa lawv mus rau lawv qhov chaw xav tau sab hauv lossis sab nraud ntawm tes?
Golgi Hais txog qhov no, dab tsi organelle yog lub luag haujlwm rau kev thauj mus los? endoplasmic reticulum (ER Qhov thib ob, cov proteins txav mus los ntawm lub cell li cas? Cov proteins txav mus los endomembrane system thiab raug xa tawm los ntawm lub ntsej muag trans ntawm Golgi apparatus nyob rau hauv thauj vesicles uas txav mus los cytoplasm thiab tom qab ntawd fuse nrog plasma membrane tso tawm protein ntau mus rau sab nraum lub cell .
Dab tsi ntawm lub xov tooj ntawm tes ua raws li qhov chaw tswj kev ua haujlwm ntawm tes?
Lub nucleus muaj cov ntaub ntawv genetic information (DNA) onspecial strands hu ua chromosomes. Function - Lub nucleus yog 'tswj chaw' ntawm lub xovtooj ntawm tes, rau cellmetabolism thiab kev yug me nyuam. Cov kab mob hauv qab no pom muaj nyob rau hauv cov nroj tsuag thiab tsiaj txhu
Yuav ua li cas cov khoom siv caj ces hauv txhua lub xov tooj tshiab tsim los ntawm kev faib tawm ntawm tes sib piv nrog cov khoom siv caj ces hauv lub xov tooj qub?
Mitosis tshwm sim nyob rau hauv ob lub nuclei uas zoo tib yam rau thawj nucleus. Yog li, ob lub hlwb tshiab tsim tom qab kev faib tawm ntawm tes muaj tib yam khoom siv caj ces. Thaum lub sij hawm mitosis, chromosomes condense los ntawm chromatin. Thaum saib nrog lub microscope, chromosomes pom nyob rau hauv lub nucleus
Ib puag ncig ntawm ib lub xov tooj ntawm tes thiab cov kab mob cuam tshuam li cas ntawm cov noob caj noob ces?
Splicing ntawm mRNA nce tus naj npawb ntawm cov protein sib txawv uas lub cev muaj peev xwm tsim tau. Gene qhia yog tswj los ntawm cov proteins uas khi rau cov hauv paus hauv paus hauv DNA. Ib puag ncig ntawm ib lub xovtooj ntawm tes thiab ntawm lub cev muaj feem cuam tshuam rau cov noob caj noob ces