Describe the structure, composition and functions of mitochondria along with a well-labelled diagram.

Mitochondria are membrane-bound organelles found in the cytoplasm of eukaryotic cells, often referred to as the "powerhouses" of the cell due to their critical role in energy production. They vary in shape, size, and number depending on the cell type and energy needs. Mitochondria are highly dynamic and can change shape, move within the cell, and undergo fusion and fission events.

### Structure of Mitochondria

Mitochondria are double-membraned organelles, consisting of two distinct lipid bilayers: the outer membrane and the inner membrane. The outer membrane is smooth and permeable to small molecules and ions, due to the presence of porins, which are large protein channels. This allows small molecules to freely pass through.

The inner membrane, on the other hand, is highly convoluted and forms folds called cristae, ____ ____ _________ __________ ___ __________ ___ __________.
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