Lub sijhawm sib txawv cov spermatids tseem cuam tshuam nrog?

Cov txheej txheem:

Lub sijhawm sib txawv cov spermatids tseem cuam tshuam nrog?
Lub sijhawm sib txawv cov spermatids tseem cuam tshuam nrog?
Anonim

Cov txiv neej cov kab mob ua rau muaj kev sib faib meiotic uas thaum kawg tsim cov phev, thaum Sertoli hlwb muab khoom noj rau cov kab mob. Li no, thaum sib txawv cov spermatids tseem cuam tshuam nrog Sertoli cell.

spermatids txawv li cas?

Nrog rau qhov pib ntawm meiosis, cov kab mob hu ua spermatocytes, thiab tom qab mus rau meiosis, cov hlwb haploid hu ua spermatids. … Lub sijhawm 13 hnub tom ntej no, cov spermatids puag ncig sib txawv rau hauv elongating spermatids uas cov phev tails tsim thiab cov nucleus condenses.

Dab tsi yog qhov txawv ntawm spermatogenesis?

Sperm differentiation encompasses ib ntu ntawm kev hloov morphological uas tshwm sim nyob rau hauv seminiferous epithelium. Nyob rau hauv cov txheej txheem no, haploid round spermatids tau txais kev hloov pauv ntawm cov qauv thiab kev ua haujlwm, ua rau cov phev polarized heev.

Yuav ua li cas rau spermatids thaum lub sij hawm spermatogenesis?

Nyob rau hauv cov ntsiab lus, spermiogenesis cuam tshuam nrog cov txheej xwm uas ua rau cov spermatozoa (sperm cells). Yog li, los ntawm ib puag ncig configuration, cov spermatids ua streamlined. Tsis muaj kev faib cell tshwm sim nyob rau theem no lawm. Tiam sis, cov spermatids hloov mus ua spermatozoa.

Puas yog txheej txheem ntawm kev sib txawv ntawm tes los ntawm cov spermatids ua phev?

Spermatogenesis yog cov txheej txheem ntawm kev tsim cov phev cell. Hloov pauv cov phev tsis paub qab hau tau ua tiav mitotic thiab meiotic divisions (spermatocytogenesis) thiab hloov pauv hloov pauv (spermiogenesis) los tsim cov spermatozoa.

Pom zoo:

Nthuav cov khoom
Lo lus prosodically txhais li cas?
Nyeem ntxiv

Lo lus prosodically txhais li cas?

hais txog lub suab thiab lub suab (=txoj kev tus neeg hais lus lub suab nce thiab ntog) ntawm cov lus: Prosodic nta ua lub luag haujlwm tseem ceeb hauv kev tsim cov qauv kev ntxhov siab hauv cov lus thiab kab lus. prosodic teebmeem zoo li suab thiab intonation.

Vim li cas kuaj cov qib calcitonin?
Nyeem ntxiv

Vim li cas kuaj cov qib calcitonin?

Kev kuaj calcitonin feem ntau yog siv txhawm rau kuaj xyuas C-cell hyperplasia thiab medullary thyroid cancer medullary thyroid cancer Medullary carcinoma yuav xa mus rau ib qho ntawm ntau hom qog nqaij hlav ntawm epithelial keeb kwm. Raws li lo lus "

Thaum twg st sebastian raug ntaus?
Nyeem ntxiv

Thaum twg st sebastian raug ntaus?

Nws tau raug ntaus los ntawm Pope Benedict XIV hauv 1743 thiab canonized hauv 1807 los ntawm Pope Pius VII. Thaum twg Sebastian dhau los ua neeg dawb huv? St. 288, Rome [Italy]; Hnub ua koob tsheej Lub Ib Hlis 20), cov ntseeg thaum ntxov tau nrov los ntawm cov neeg pleev kob Renaissance thiab ntseeg tias tau tua neeg thaum muaj kev tsim txom ntawm cov ntseeg los ntawm Roman huab tais Diocletian.