The Journal of General Physiology
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The Journal of General Physiology, Vol 57, 738-751, Copyright © 1971 by The Rockefeller University Press

ARTICLE

Electrophysiological Studies of the Smooth Muscle Cell Membrane of the Rabbit Common Carotid Artery

F. Mekata 1

1 From the Department of Physiology, Yamaguchi University School of Medicine, Ube, Japan

The electrical responses of the smooth muscle cells of the rabbit common carotid artery to extracellular stimulation were studied in isotonic and hypertonic solution (1.7 times normal tonicity) with microelectrodes. No spontaneous electrical or mechanical activity was recorded when the tissue was in either isotonic or hypertonic solution. The voltage-current relation of smooth muscle cells in the common carotid artery showed marked rectification in both isotonic and hypertonic solutions. In isotonic and hypertonic solutions mean values for membrane potentials were -44.5 and -51.5 mv, for space constants 1.13 and 1.21 mm, and for time constants 212.2 and 238.2 msec, respectively. Addition of 34.3 mM TEA to the solutions caused spontaneous action potentials in the common carotid artery. The action potentials recorded simultaneously from two microelectrodes showed good synchronization. It was concluded that there is electrical transmission between cells of this artery.

Submitted on November 3, 1970


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H. KURIYAMA, K. KITAMURA, T. ITOH, and R. INOUE
Physiological Features of Visceral Smooth Muscle Cells, With Special Reference to Receptors and Ion Channels
Physiol Rev, July 1, 1998; 78(3): 811 - 920.
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