Reports

Transmembrane Action Potentials from Smooth Muscle in Turtle Arteries and Veins

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Science  15 Sep 1961:
Vol. 134, Issue 3481, pp. 736-737
DOI: 10.1126/science.134.3481.736

Abstract

Transmembrane potential and active tension were measured in isolated segments of turtle aorta and inferior vena cava. Changes in tension were associated with action potentials, but the potentials had a different pattern in the two tissues. When the frequency of the action potentials increased, the contractions summated, resulting in a steadily maintained contraction.