nephron structure. urine formation organ, functional unit of the kidney.

nephron tubule artery biology internal physiology filtration human proximal health arteriole blood electrolytes bowman capsule diseases renal cross section loop henle distal kidney anatomy glomerulus structure function urine duct system urinary medicine capillaries medical removal efferent nephrology cortex dialysis peritubular nephritis urinating afferent organ formation functional unit diagram excretory studying