RATE OF PEJ^ETRATIOX OF PHOSPHATE INTO MUCSLE CELLS 453 



0.082 mgm P was found to ponetrate into the cells of 1 gm gastrocnemius muscle 

 and vice versa. At 0°, Y^ of tlio above value was found. 



An alternative method wich is independent of the knowledge of the size of the 

 extracellular space is based on the determination of the comparison of the active 

 inorganic phosphorus content of the plasma with the active organic phosphorus 

 content of the muscle. By this method, the amount of plasma P penetrated into 

 1 gm muscle in the course of 4 days was found to be 0.088 mgm. 



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