Hoshi was a citizen of the ancient island nation of Yamatai and a Daughter of the Sun at some point during the Kamakura period (c. 1185-1333 CE). She was chosen by Queen Himiko to be her successor.
Muscle contraction happens only when the energy molecule called adenosine triphosphate (ATP) is present. ATP has three phosphate groups that it can give away, releasing energy each time.
Under resting conditions, muscle cells can make plenty of ATP to support contraction. As ATP is an unstable molecule and more ATP is made than is needed under resting conditions, the excess ATP is broken down by creatine phosphokinase, which catalyzes the synthesis of creatine phosphate (CP) from ATP and creatine.