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Why cells of nephron tubules present huge mitochondria

Why do cells of nephron tubules present a huge amount of mitochondria?

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The cells of tubule wall contain high number of mitochondria since most of the substances are resorbed or secreted via them by means of active transport (a process which spends energy). Therefore most mitochondria are essential for the energetic supply (that is, ATP supply) of this kind of transport.

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