Description of urine formation with the help of a diagram.
PROCESS OF URINE FORMATION
Each kidney has very minute tubular and convoluted structures known as urniferous tubules. Nephrons in each kidney has ten lacs such tubules. Each nephron has a double walled cup shaped structure called bowman’s capsule at its upper end.
The bowman’s capsule has numerous capillaries called glomerulus. The short region after the Bowman’s capsule is called the neck. After this the tubule is narrow and coiled. It consists of a proximal convoluted region, a Henle’s loop and a distal convoluted tubule. The post end of nephron is called collecting tubule.
Collecting tubule opens into the renal pelvis, which opens into the ureter
The image of the structure of nephron is below:
The waste material along with blood is brought to kidneys by the renal arteries. Blood is filtered out from blood capillaries into Bowman’s capsule under pressure which is known as Ultrafiltration. This filtrate passes through the lumen of tubular parts of nephron. During this useful products such as water, glucose, amino acid, materials, ions etc. are reabsorbedby blood capillaries surrounding the nephron. The remaining fluid contains excretory substance and is called urine. From the ureter urine passes into urinary bladder where is is stored. When the bladder is filled with urine, it contracts and urine passes out of the body.
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