Calcium Efflux Coupled ATP Synthesis

in sarcoplasmic reticulum membranes a conversion of osmotic into chemical energy can most easily be demonstrated, and since the concentrations of all reactants are known at every moment, the energetics of the process is well defined. This reversibility is described by the following over all reaction (Table 9). 

(3) the hexokinase reaction ATP + glucose = ADP + glucose-6-phosphate with a standard free energy of AG b = -14.5 kJ/mol is introduced. AGb, standard free energy for ATP hydrolysis. 

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