AFunctions of the colon

m ro Storage of faecal content with periodic controlled evacuation.

te Further reabsorption of water, sodium and chloride. Active transport of tin sodium is achieved with accompanying absorption of water.

pp Secretion of potassium by K+/H+ ATPase on the apical membrane.

y Secretion of bicarbonate.

1 Maintenance of bacterial microflora.

g y Rapid metabolism of malabsorbed sugars and of dietary fibre (polysaccharide)

to short-chain fatty acids by bacteria and absorption by passive diffusion. Bacteria produce vitamin K.

Bacterial gas (flatus) produced by fermentation of undigested polysaccharides.

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