The filtrate in the ____ convoluted tubule is a solution containing many solutes such as ____, urea, salt, amino acids and many ions. Urine is a solution containing salt, urea and water. It is formed from the filtrate through ____ reabsorption of substances back into the ____. ____ of the glucose in the filtrate is ____ from the PCT so that there is no glucose in the urine. It is reabsorbed by ____ diffusion and is co transported with sodium ions through carrier proteins embedded in the ____ membrane of the PCT cell. Most of the ____ is also reabsorbed in the PCT by ____. The loop of Henle sets up a sodium ion ____ gradient across the medulla so that water can continue to be absorbed along the whole length of the collecting duct. The ____ is affected by ____, a hormone which makes the wall of the collecting duct more ____ so that more water can be reabsorbed, making a smaller volume of concentrated urine when water content of the blood is low.

Selective reabsorption

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