Urine Formation A. Urine-Forming Processes 1. Blood cells, proteins, and other large solutes cannot pass the capillary wall into the capsule. Filtrate is collected by the Bowman's capsule and funneled into the proximal tubule. Filtration is rapid-about 180 liters of fluid total are removed each day. During reabsorption most of the filtrate's water and solutes move out of the nephron tubules and into adjacent blood capillaries.
Hormones induce adjustments in urine concentration.