A phosphagen; a compound of creatine (through its NH2 group) with phosphoric acid; a source of energy in the contraction of vertebrate muscle, its breakdown furnishing phosphate for the resynthesis of ATP from ADP by creatine kinase. Cf.:phosphoarginine. SYN: creatine phosphate, Nω-phosphonocreatine.
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phos·pho·cre·atine .fäs-(.)fō-'krē-ə-.tēn n a compound C4H10N3O5P of creatine and phosphoric acid that is found esp. in vertebrate muscle where it is an energy source for muscle contraction called also creatine phosphate
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n.
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phos·pho·cre·a·tine (PC) (fos″fo-kreґə-tin) the phosphagen of vertebrates, a substituted derivative of phosphoguanidine. It is an important storage form of high-energy phosphate, the energy source for muscle contraction; as ATP levels diminish with muscular exertion, the phosphoryl group of phosphocreatine can be donated to ADP to replenish ATP.Medical dictionary. 2011.