Abstract
Experiments were performed on rectus abdominis muscles in frogs. A study was made of the effect produced by adrenaline on the development of contracture during the action of acetylcholine, potassium chloride and proserine. As established, a drenaline depresses the development of potassium and proserine contractures of the frog's rectus abdominis. The known data are confirmed by the fact that adrenaline produces no effect on the development of acetylcholine contracture of the rectus abdominis in a frog. The mechanism of adrenaline action of the contractures, evidently, brings to muscle proteins increased ability to bind potassium ions.
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