biological role ryanodine receptor modulator ryanodine receptor agonist A ryanodine receptor modulator which activates the receptor. Ryanodine receptors (RyRs) act as selective ion channels, modulating the release of calcium. Activating the receptors causes the release of calcium, so depleting internal calcium and ultimately preventing further muscle contraction. CHEBI:67114 RyR activator RyR activators RyR agonist RyR agonists RyRs activator RyRs agonist Wikipedia:Ryanodine_receptor chebi_ontology ryanodine receptor activator ryanodine receptor activators receptor activator activity