Learning Objectives By the end of this section, you will be able to: List specific transport mechanisms occurring in different parts of the nephron, including active transport, osmosis, facilitated diffusion, and passive electrochemical gradients List the different membrane proteins of the nephron, including channels, transporters, and ATPase pumps Compare and contrast passive and active tubular … Continue reading 25.5 Physiology of Urine Formation: Tubular Reabsorption and Secretion