Kayendedwe ka moyo maselo - zapakati pa kubadwa kwake kwa kugawa palokha kapena imfa

Kayendedwe ka moyo wa maselo - nthawi ya pulayimale unit wa anthu amoyo penipeni magawano yakeyake magawano kapena imfa. Pamafunikanso kusintha zonse zachilengedwe kukumana organelles pogwira ntchito zake.

Malinga ndi bungwe ndi specialization muyezo wake selo mkombero ukhoza pa mphindi 30 ndi masiku 3. Mwachitsanzo, pamene onongani maselo mu echinoderms kayendedwe ka moyo ndi mphindi 30, ndi khungu matumbo anthu - mwa maola 12. Palinso anthu mayunitsi zofunikira pa moyo, zimene si wogawanika, ie, kodi kubereka, iwo akuchita ntchito zawo anafuna ndi kufa - .. monga mitsempha, striated ulusi minofu. Self mkombero moyo foni akhoza kugawidwa m'mbali ziwiri: interphase, kapena nyengo ya kukula ndi mitosis - nthawi magawano. Interphase zikuphatikizapo, motero, chiwerengero cha magawo:

1. G1 (postmitotic) - koyamba kukula kwake. Pa nthawi imeneyi, khamu la mRNA, mapuloteni ndi mbali zina selo.
2. S (kupanga) - kumachitika DNA kugawanika imbaenda ku anawaonjezera kuwirikiza kawiri chuma chibadwa. Kumapeto kwa gawo awiri ofanana mawonekedwe DNA awiri helix. Aliyense wa chingwe cha deoxyribonucleic acid limapangidwa akale mwauzimu wina, ndipo chachiwiri - wina watsopano, umene unakhazikitsidwa pa maziko a mapolojekiti.
3. G2 (premitotic) - ndi kukonza ndondomeko, womwenso kuwukonza zolakwa m'kati DNA kaphatikizidwe mu gawo m'mbuyomu. Kudziunjikira zakudya, mphamvu, kupitiriza lithe mapulotini RNA.

The mfundo ndi kubalana mitotic mkombero wa khungu proliferative kapena limene limayamba mwachindunji pambuyo G2. Ndi mndandanda wa zomwe zimachitika ku pulayimale structural unit wa moyo kuchokera Chigawo chimodzi ku mapeto ena ndi kupanga mbadwo watsopano wa maselo wocheperapo. Mitosis ndi mtundu waukulu kuimira somatic (kuchita nawo kubereka) mayunitsi chiyambidwe cha zamoyo nyukiliya.

Kayendedwe ka moyo maselo zofunika kwa thupi, kupereka chitetezo cha nambala ndi mawonekedwe DNA khalidwe la mtundu uliwonse wa zamoyo (karyotype), choncho nkofunika kuti nthawi zonse magawano zapita popanda chosokoneza chilichonse. Mitosis wapangidwa ndi mbali 4 zotsatizana:

1. Prophase. Nthawi imeneyi, magawano selo amapezeka ndi zikusiyana pakati pa mizati centrioles, amene cholukanalukana ndi magawano ndi spindle. Pakutha nthawi imeneyi nucleoli apasuke khromozomu unakhuthala ndi kufupikitsidwa, i.e. ndi condensation awo.
2. Metaphase. Kapangidwe Nucleoprotein limagwirizana pamodzi maselo equator anapanga metaphase mbale. Pakubwera constriction yaikulu ya DNA ndi. Aliyense wa iwo lagawidwa chromatids awiri.
3. Anaphase. Mu gawo ili obrazovashiesya DNA mwana kusuntha kwa mizati osiyana kumene iwo ali lathyathyathya kunja ndi unwind.
4. Telophase. Anabwezeretsa nucleolus ndi pakati Chigawo cha cytoplasm amapezeka.

Choncho, selo mkombero - nthawi ya moyo chibadwire ku pulayimale unit wa imfa ya moyo.