<P> The basic structural and functional unit of the kidney is the nephron . Its chief function is to regulate the concentration of water and soluble substances like sodium by filtering the blood , reabsorbing what is needed and excreting the rest as urine . </P>
<P> The basic structural and functional unit of the kidney is the nephron . Its chief function is to regulate the concentration of water and soluble substances like sodium by filtering the blood , reabsorbing what is needed and excreting the rest as urine . </P>
where does reabsorption take place in the urinary system
where does reabsorption take place in the urinary system
the nephron
the nephron