<P> Terminal cisternae are enlarged areas of the sarcoplasmic reticulum surrounding the transverse tubules . These discrete regions within the muscle cell store calcium ( increasing the capacity of the sarcoplasmic reticulum to release calcium ) and release it when an action potential courses down the transverse tubules , eliciting muscle contraction . Because terminal cisternae ensure rapid calcium delivery , they are well developed in muscles that contract quickly , such as fast twitch skeletal muscle . Terminal cisternae then go on to release calcium , which binds to troponin . This releases tropomyosin , exposing active sites of the thin filament , actin . </P>
<P> Terminal cisternae are enlarged areas of the sarcoplasmic reticulum surrounding the transverse tubules . These discrete regions within the muscle cell store calcium ( increasing the capacity of the sarcoplasmic reticulum to release calcium ) and release it when an action potential courses down the transverse tubules , eliciting muscle contraction . Because terminal cisternae ensure rapid calcium delivery , they are well developed in muscles that contract quickly , such as fast twitch skeletal muscle . Terminal cisternae then go on to release calcium , which binds to troponin . This releases tropomyosin , exposing active sites of the thin filament , actin . </P>
what is the function of the terminal cisternae
what is the function of the terminal cisternae
store calcium ( increasing the capacity of the sarcoplasmic reticulum to release calcium ) and release it when an action potential courses down the transverse tubules , eliciting muscle contraction
store calcium ( increasing the capacity of the sarcoplasmic reticulum to release calcium ) and release it when an action potential courses down the transverse tubules , eliciting muscle contraction