It might be best to walk through a SSL/TLS certificate exchange with a Web server that's using self-signed certificates: 1  I open my Web browser and type the URL https://www.mpkselfsign.com.  The mpkselfsign.com Web server sends the self-signed certificate for www.mpkselfsign.com back to my Web browser.
The proximal tubules make up a significant portion of the kidneys; proximal tubule epithelial cells are the most populous cell type in the kidney, and carry out diverse regulatory and endocrine functions where numerous transporters are located.he proximal tubules make up a significant portion of the kidneys; proximal tubule epithelial cells are the most populous cell type in the kidney, and carry out diverse regulatory and endocrine functions where numerous transporters are located.
The renal tubule carries urine from the glomerular capsule to the renal pelvis. 1  The curvy first section of the renal tubule is known as the proximal convoluted tubule. 2  The tubule cells that line the proximal convoluted tubule reabsorb much of the water and nutrients initially filtered into the urine.ldosterone stimulates the cells of the kidney to increase their reabsorption of sodium and water to maintain blood volume and pressure. Hormones. The kidneys maintain a small but important endocrine function by producing the hormones calcitriol and erythropoietin. 1  Calcitriol is the active form of vitamin D in the body.