<P> Within the nephron of the kidney, the descending limb of loop of Henle is the portion of the renal tubule constituting the first part of the loop of Henle . </P> <P> The permeability is as follows: </P> <Table> <Tr> <Td> Substance </Td> <Td> Permeability </Td> </Tr> <Tr> <Td> ions </Td> <Td> Low permeability . Sodium and chloride ions do not easily pass through . </Td> </Tr> <Tr> <Td> urea </Td> <Td> Moderate permeability . </Td> </Tr> <Tr> <Td> water </Td> <Td> Highly permeable . Water is readily reabsorbed from the descending limb by osmosis . </Td> </Tr> </Table> <Tr> <Td> Substance </Td> <Td> Permeability </Td> </Tr>

The descending limb of the loop of henle is permeable to
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