Electrophysiological aspects of regulation of precapillary vessel tone in smooth muscles of vascular tissues.


The tone of precapillary vessels is regulated by free-Ca concentrations in the myoplasm. If the concentration of Ca decreases below 10(-7) M, the muscle relaxes. Maximal amplitudes of contraction are recorded when the concentration of Ca is higher than 5 X 10(-6) M. Certain aspects of Ca regulation require electrical activity of the cell membrane. To… (More)


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