The complete set of mitochondria within a single cell, or the mitochondrial system as a whole.
From Greek 'chondros' (grain) + 'soma' (body), coined in early 20th century biology to describe the totality of mitochondrial structures in a cell. The term reflects the granular appearance of mitochondria under early microscopes.
Scientists literally called mitochondria 'grains' because that's what they looked like under the first microscopes—proving that our understanding of cell biology was built on creative metaphors from what people could actually see!
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