Urine Formation

Urine Formation - Glomerular Filtration

The first step of urine formation is glomerular filtration Takes place in the renal corpsule when fluid is forced out of blood & is collected by glomerular capsule Efferent arteriole narrows increasing resistance to blood flow and increasing pressure in glomerulus  Blood and other components are forced through the membrane & into the capsule  A fluid called filtrate is left

Glomerular Filtration (binary/octet-stream)

Caption: : Glomerular Filtration

Urine Formation - Reabsorption

The next process is called reabsorption Selective reabsorption of the filtrate takes place in the renal tubule During selective reabsorption, water, glucose, amino acids, ions and wastes like urea are absorped The large surface area of the long length of the kidney tubule allows for effective reabsorption

Selective Reabsorption2 (binary/octet-stream)

Urine Formation - Tubular Secretion

Whereas selective absorption removes substances from filtrate into the blood, tubular secretion adds to the filtrate from the blood To raise the pH of the blood, the tubules secrete hydrogen and ammonium ions into the filtrate The now produced urine drains into the ureters and stored in the urinary bladder