Biology / Bio 0271 · Atom · ~20 seconds
Mitochondria
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A mitochondrion is a double-membrane organelle that produces most of a cell's ATP by cellular respiration, its inner membrane folded into cristae.
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Muscle cells, which demand large amounts of ATP for contraction, pack an especially high concentration of mitochondria.
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Mitochondria carry their own DNA and ribosomes, distinct from those in the nucleus and cytoplasm.