Assertion: sarcoplasmic reticulum | /r/CapableOf | serve as reservoir
Facets:
value: for calcium ions
type: PURPOSE
Source sentences:
text: The sarcoplasmic reticulum serves as reservoir for calcium ions, so when an action potential spreads over the T tubule, it signals the sarcoplasmic reticulum to release calcium ions from the gated membrane channels to stimulate a muscle contraction.