It is suggested that, at least in frog skeletal muscle, the high [K+]O induced potentiation of caffeine contracture is mainly due to an increase of myoplasmic free calcium.

• 提示, 至少在蛙骨骼肌, 高钾引起的咖啡因挛缩增强主 要是由胞浆自由钙升高引起的。