By Roland A. Coulson, Thomas Hernandez
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Additional info for Alligator Metabolism Studies on Chemical Reactions in Vivo
By random chance, in 1 min a constant per cent of the product would be reconverted to substrate, and both the rate of the forward and the back reac tions would occur at a rate proportional to blood flow. In animals differing greatly in blood flow, the rate constants would be the same for the reverse reac tions if the constants were derived from an equation which includes the flow factor F. At the distal side of the cell the ratio of molecules of product to substrate re-entering the distal capillary will be constant in all animals, but the rate at which both re-enter the plasma will be proportional to the blood flow.
The equation for a second-order reaction in kin etics in the flask is V = k [ A ] [ B ] with the rate of product synthesis proportional to the arithmetic product of the concentrations of two reactants (A and B). In a vertebrate, the equation for second-order reactions (which seem to be rare) would be V = Κ [A] [B]F. Whether a reaction is first- or second-order in a live animal the equation must contain a flow factor. The flow equations predict that all catabolic reac tions will be affected by blood flow.
The enzymes in the Embden-Meyerhof glycolytic chain are present therefore in ample amounts in both but they are almost inactive during oxidative metab olism in the alligator. ) the demand of the muscle and it is this blood flow that permits the reactions to go at a high rate. In maximum anaerobic catabolism, the enzymes of muscle cells in a large alligator are in contact with more glucose (phosphate) in 20 sec than they could obtain from the blood in 10 hr. At first thought, it seemed to us that where the rate of oxidative catab- Alligator metabolism olism was directly proportional to blood flow, anaer obic glycolysis proceeded rapidly in a static system, and at a rate determined by substrate concentration only.