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Vladimír Palat

1. The Mg, Ca, Na and K content were determined in the rat tail artery in vitro under various experimental conditions.

2. The arterial Mg could be varied selectively at a constant [Mg]_o by altering the content of intracellular compounds capable of forming complexes with Mg²⁺ such as nucleoside-5'-triphosphates or citrate.

3. The release of tissue Mg during incubation in Mg-free solutions was found to consist of a fast and a slow component. The size of the fast component was dependent on the original [Mg]_o. The size of the slow component was dependent on the content of intracellular compounds forming complexes with Mg²⁺. The rate of efflux of the slow component could be increased by increasing [Mg²⁺]_i, by removing external Ca, or by making the artery metabolically inactive.

4. The results seem to indicate that [Mg²⁺]_i in metabolically active vascular smooth muscle cells is maintained at a level of ca. 10^-4 M.