Sugar intestinal bacteria

With the exception of the phosphotransferase system that is responsible for uptake of several sugars by bacteria, the active uptake of organic solutes is secondary active and coupled via cotransport to the downhill transport of a cation, Na in animal cells and H ions in microorganisms. In transcellular transport in epithelia, such as small intestine and proximal tubule of the kidney, the solutes are accumulated inside the cell via a cotransport mechanism at the luminal membrane, and leave the cell passively presumably by facilitated diffusion at the eontraluminal side. 

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