URINARY SYSTEM INFORMATION- PROCESS OF FILTRATION-KIDNEYS-LESSON 75

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In this lesson we will see about the process of filtration of kidneys.  Kidneys manufacture urine by a process called filtration. Each microscopic glomerulus wall is thin enough to allow water, sugar, salt, urea, and other nitrogenous wastes like uric acid and creatinine to go away the bloodstream. These materials going away from each glomerulus are accumulated in a minuscule cup-like structure called Bowman's capsule, which encloses each glomerulus. The walls of the glomeruli check large substances like proteins and blood cells from filtering into the Bowman's capsules. These substances stay behind in the blood and normally do not come into view in urine.

Renal tubule is a long twisted tube attached to the Bowman's capsule. These tubules are covered by tiny capillaries. When the water, sugar, urea, salts and other nitrogenous wastes pass through these renal tubules, all of the sugar and most of the water and some salts go again to the bloodstream. This process is called re-absorption.

Through this process only vital materials like sugar, salts, water, and acids retain into the body. Some salts, acids, sugar, and water remain in the renal tubule after this process. The remaining material in the renal tubule called urine now contains 95% of water, 5% urea, creatinine, salts, and acids. These renal tubules are combined in a larger collecting tubule, and thousands of these collecting tubules show the way to the renal pelvis, a reservoir in the central area of the kidney. Calices (singular-calix or calyx) are the small, cup-like sections of the renal pelvis.

The renal pelvis tapered into the ureter. The ureter carries the urine to the urinary bladder where the urine is for the short term stored. The outlet area of the bladder is closed by sphincters that allow the urine to run off the bladder. When the bladder fills up, a pressure is situated on the bottom of the urethra, so that only we feel to urinate.

In the next lesson we will see the normal composition of chemicals of urine. ok

Come on...

To go to the next lesson from here please click the link below

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