The matrix contains the enzymes that are responsible for the citric acid cycle, B oxidation. aa oxidation and etc. The matrix also contains dissolved o2, h,o, co2, the recyclable intermediates that serve as energy shuttles, and much more. Because of the folds of the cristae, no part of the matrix is far from the inner membrane Therefore matrix components can quickly reach inner membrane complexes and transport proteins.The matrix contains the enzymes that are responsible for the citric acid cycle, - oxidation, AA oxidation and etc. The matrix also contains dissolved O2 , H2O, CO2 , the recyclable intermediates that serve as energy shuttles, and much more. Because of the folds of the cristae, no part of the matrix is far from the inner membrane. Therefore matrix components can quickly reach inner membrane complexes and transport proteins