Refer to Animation: Filtration, Reabsorption, Secretion. Cells of the excretory tubule water by osmosis, from which we can conclude that the solute concentration in these cells must be than in the filtrate. reabsorb; lower excrete; higher reabsorb; higher excrete; lower 2. Refer to Animation: Filtration, Reabsorption, Secretion. What drives the reabsorption that occurs in animal excretory systems