Ob lub davhlau ya nyob twg cistemae ntawm SR ua ke nrog lawv cov T tubule uas muaj feem xyuam yog hu ua triad. Hauv cov leeg nqaij, T-tubules nyob ib sab ntawm lub davhlau ya nyob twg cisternaentawm cov txheej txheem sab hauv tau los ntawm endoplasmic reticulum, hu ua sarcoplasmic reticulum (SR), uas yog lub khw ntawm calcium. ions.
Tus qauv tsim ntawm T-tubules thiab lub davhlau ya nyob twg cisternae yog dab tsi?
Nyob rau hauv histology ntawm skeletal leeg, a triad yog cov qauv tsim los ntawm T tubule nrog sarcoplasmic reticulum (SR) hu ua lub davhlau ya nyob twg cisterna ntawm ob sab. Txhua lub cev nqaij daim tawv nqaij muaj ntau txhiab triads, pom nyob rau hauv cov leeg nqaij fibers uas tau muab faib ua longitudinally.
Lub davhlau ya nyob twg cisternae thiab T-tubule cuam tshuam li cas hauv cov leeg nqaij?
Terminal cisternae yog thaj chaw sib cais hauv cov leeg nqaij. Lawv khaws calcium (ua kom lub peev xwm ntawm sarcoplasmic reticulum tso calcium) thiab tso nws thaum qhov kev ua haujlwm muaj peev xwm ua rau cov tubules transverse, eliciting nqaij contraction.
Vim li cas nws tseem ceeb rau cov tubules transverse kom zoo sib xws nrog lub davhlau ya nyob twg cisternae?
Qhov no yog qhov tseem ceeb raws li nws txhais tau tias tias calcium ntau nyob rau hauv lub cell yuav nruj tswj tau nyob rau hauv ib cheeb tsam me me(piv txwv li ntawm T-tubule thiab sarcoplasmic reticulum, hu ua kev tswj hauv zos.). Proteins xws li sodium-calcium exchanger thiab sarcolemmal ATPase yog nyob rau hauv lub T-tubule daim nyias nyias.
Dab tsi yog pab pawg ntawm T-tubule thiab ob qhov chaw nyob ib puag ncig cisternae hu ua?
Ib pawg muaj xws li T tubule, los ntawm sab nraud ntawm cov leeg nqaij fiber ntau, thiab ob lub davhlau ya nyob twg cisternae, los ntawm sab hauv cov leeg nqaij, hu ua a triad T tubules ua rau muaj peev xwm ua tau raws li qhov chaw ntawm cov leeg nqaij mus rau hauv triads uas ua rau kev tso tawm ntawm Ca2+ ions los ntawm lub davhlau ya nyob twg cisternae.
