Selective reasorption

Molecules move from the PCT through the epithelial lining the PCT and through the endothelial cells lining the capillaries ALL the glucose molecules move from PCT and into the blood via facilitated diffusion (from a high to low concentration through carrier/channel proteins) and by active transport (from low to high conc via carrier proteins – this requires energy) ALL amino acids are reabsorbed in the same way as glucose. The high conc of glucose and amino acids in the blood cause the water potential in the blood to decrease. So water moves out of the PCT and into blood via osmosis (from a high to low water potential)