Qhov Tseem Ceeb Qhov txawv - Troponin vs Tropomyosin
Nws yog ib qho tseem ceeb kom nkag siab txog cov txheej txheem ntawm cov leeg nqaij thiab so kom zoo ua ntej kawm qhov txawv ntawm troponin thiab tropomyosin. Cov nqaij fibers yog tsim los ntawm myofibrils. Myofibrils yog tsim los ntawm cov proteins ntev uas muaj nyob rau hauv cov ntu hu ua sarcomeres, uas yog cov tsev tsim qauv ntawm cov leeg nqaij striated. Sarcomere muaj ob yam hu ua nyias thiab tuab filaments ua los ntawm actin thiab myosin proteins feem. Thick thiab nyias filaments ntawm myosin thiab actin yog teem ib sab ntawm ib leeg nyob rau hauv lub sarcomere. Kev sib cuam tshuam ntawm ob cov proteins nyob rau hauv txhua sarcomere ua rau lub sarcomere luv, uas nyob rau hauv lem, ua rau nqaij contraction. Thaum lub sij hawm sarcomere contraction, myosin taub hau nyob rau hauv tuab filaments khi nrog actin nyob rau hauv lub nyias filaments thiab rub lub nyias filaments ntawm qhov chaw. Qhov kawg ntawm cov sarcomeres yog rub los ze zog ua ke, shortening qhov ntev ntawm cov nqaij fibers. Calcium ions yog xav tau rau kev cog lus ntawm sarcomere. Thaum calcium ion concentration nce, cov leeg nqaij sib cog lus thiab thaum nws qis, cov leeg yuav so. Troponin thiab tropomyosin yog ob cov proteins uas tswj cov sarcomere contraction ntawm calcium binding. Thaum muaj calcium ions, calcium khi nrog troponin thiab tshem tawm tropomyosin. Nws nthuav tawm myosin khi qhov chaw hauv actin. Thaum cov leeg tau so, tropomyosin blocks myosin binding qhov chaw hauv actin filaments. Qhov sib txawv tseem ceeb ntawm troponin thiab tropomyosin yog tias troponin tso cov myosin binding qhov chaw ntawm actin filaments thaum tropomyosin thaiv cov chaw khi.
Troponin yog dab tsi?
Raws li tau piav qhia saum toj no, Troponin yog ib hom protein uas tswj cov sarcomere contraction ntawm calcium binding. Troponin yog li txuam nrog actin filaments.
Thaum cov calcium ions thiab ATP muaj, calcium ions khi nrog troponins. Thaum calcium ions raug khi rau troponin, nws ua rau muaj qhov cuam tshuam ntawm myosin khi qhov chaw ntawm actin filaments los ntawm kev tshem tawm tropomyosins los ntawm actin filaments. Yog li, myosins (thick filaments) khi nrog actin (nyias filaments) thiab rub nyias filaments ntawm qhov chaw. Nws ua rau sarcomere cog lus thiab ua kom nws ntev.
Daim duab 01: Troponin thiab Tropomyosin
Troponin muaj nyob ua ib qho ntawm peb txoj kev tswj hwm cov protein (troponin C, troponin I, thiab troponin T). Troponin yog lub luag haujlwm rau cov leeg nqaij.
Tropomyosin yog dab tsi?
Tropomyosin yog lwm hom kev tswj hwm cov protein cuam tshuam nrog nyias cov filaments ntawm myofibrils. Thaum cov leeg nyob hauv daim ntawv so, tropomyosins thaiv cov myosin khi qhov chaw ntawm cov actin filaments. Tropomyosins tau muab tso rau ntawm actin filaments nyob rau hauv xws li ib txoj kev uas txoj kev khi ntawm myosin taub hau rau khi qhov chaw ntawm cov actin filaments yog tiv thaiv. Thaum tiv thaiv kev sib cuag ntawm myosin thiab actin, cov leeg nqaij yuav tsum nres. Txawm li cas los xij, thaum muaj cov calcium ions txaus thiab ATP, tropomyosin tuaj yeem dov tawm tropomyosin los ntawm actin filaments. Thaum tropomyosins raug tshem tawm los ntawm actin filaments, myosin khi qhov chaw raug nthuav tawm thiab kev sib cuam tshuam ntawm actin thiab myosin tau yooj yim. Myosin txoj kev khi rau actin ua rau hla choj tsim thiab kev cog lus ntawm cov leeg.
Tropomyosin yog ob txoj hlua khi alpha helical coiled coil protein. Tropomyosins feem ntau muab faib ua ob pawg; Cov leeg tropomyosin isoforms thiab nonmuscle tropomyosin isoforms.
Dab tsi zoo sib xws ntawm Troponin thiab Tropomyosin?
- Troponin thiab tropomyosin yog cov txheej txheem tswj cov leeg nqaij.
- Troponin thiab tropomyosin txuas rau actin filaments.
- Ob leeg muaj nyob hauv myofibrils.
Qhov txawv ntawm Troponin thiab Tropomyosin yog dab tsi?
Troponin vs Tropomyosin |
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| Troponin nthuav tawm cov myosin khi qhov chaw hauv cov actin filaments. | Tropomyosin npog cov chaw nquag ntawm actin uas myosin khi. |
| Muscle Movement | |
| Troponin pab txhawb kev cog lus. | Tropomyosin tiv thaiv kev cog lus thiab ua rau cov leeg so. |
Summary – Troponin vs Tropomyosin
Troponin thiab tropomyosin yog ob txoj kev tswj hwm cov protein uas cuam tshuam nrog actin filaments ntawm myofibrils. Ob leeg koom nrog hauv kev tswj hwm ntawm cov leeg nqaij contraction. Troponin ua rau tshem tawm tropomyosin los ntawm actin filaments thiab raug myosin khi qhov chaw ntawm actin filaments. Tropomyosins thaiv myosin khi qhov chaw ntawm actin filaments. Troponin pab txhawb sarcomere contraction thaum tropomyosin pab txhawb cov leeg nqaij. Qhov no yog qhov txawv ntawm troponin thiab tropomyosin.
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Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline hom phiaj raws li cov ntawv sau tseg. Thov download PDF version ntawm no Qhov txawv Ntawm Troponin thiab Tropomyosin.
