EFFECTS OF VARIOUS IONS AND ADRENALINE ON THE MECHANICAL ACTIVITY OF RABBIT MESENTERIC VEIN

Abstract

quency of 7 to 11 per minute. And the spontaneous action potentials (about 1 mV) were seen very rarely for long exposure in the normal solution. High potassium-Krebs solution produced the strong contraction and Ca-free-Krebs solution decreased the resting tonus and diminished the rhythmic contractions. Adrenaline produced the strong contraction at a concentration of 2•~10-7 and of 2•~10-6g/ml. In Ca-free solution, adrenaline produced only a small increase of resting tonus at a concentration of 2•~10-7 but high