<P> Much of renal physiology is studied at the level of the nephron , the smallest functional unit of the kidney . Each nephron begins with a filtration component that filters the blood entering the kidney . This filtrate then flows along the length of the nephron , which is a tubular structure lined by a single layer of specialized cells and surrounded by capillaries . The major functions of these lining cells are the reabsorption of water and small molecules from the filtrate into the blood , and the secretion of wastes from the blood into the urine . </P>
<P> Much of renal physiology is studied at the level of the nephron , the smallest functional unit of the kidney . Each nephron begins with a filtration component that filters the blood entering the kidney . This filtrate then flows along the length of the nephron , which is a tubular structure lined by a single layer of specialized cells and surrounded by capillaries . The major functions of these lining cells are the reabsorption of water and small molecules from the filtrate into the blood , and the secretion of wastes from the blood into the urine . </P>
where do filtration secretion and reabsorption take place
where do filtration secretion and reabsorption take place
kidney
kidney