THE INORGANIC PHOSPHORUS OF BLOOD AND MUSCLE

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Abstract
The inorganic P of mammalian muscle is increased during contraction by the decomposition of Fiske''s phosphocrea-tine.Theincrease in inorganic P is less than the disappearing phosphocreatine would indicate, as has been shown before. The venous blood passing through contracting muscles, even after stasis, did not contain more inorganic P than arterial blood. The results show that even prolonged muscular contraction does not raise the blood inorganic P concentration in the muscles, and that the increases reported after muscular exercise should be ascribed to some other source.

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