Abstract
Muscle and plasma analyses 1, 3, 5, 8, or 18 minutes after vasopressin injection (25 mu./100 gm.) in separate groups of rats showed an immediate intracellular gain of water and sodium with a net rise in [Na]1 and fall in [Na]0 and converse, changes in K. A rebound effect was noted at 18 minutes. Na, K and water moved at separate rates.