Proximal Convoluted Tubule
Proximal Convoluted Tubule

Proximal Convoluted Tubule

The proximal convoluted tubule is the site where majority (65%) of ions and water in the urinary space is reabsorbed back into the body. The cells of the proximal convoluted tubule have a deeply stained, eosinophilic cytoplasm. The cells are large so that in cross section not every nucleus will be visible, making it appear that the proximal convoluted tubule has fewer nuclei than other tubules. The cells also have an apical brush border to increase their surface area.