Why inner membrane of mitochondria deeply folded?

Various chemical reactions take place in cell mitochondria. The inner membrane of mitochondria is deeply folded to provide maximum surface area to the chemical reactions that take place here.

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The inner membrane of the mitochondria is folded to make more surface area where chemical reactions can take place. The more the folds, the bigger the surface. These folds are called cristae. The molecules and some of the enzymes that are responsible for making ATP are situated in and on the folds of these inner membranes.

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