Name: Unicellular Organisms: Life Processes
Uploaded: 2019-07-19
Duration: 3 min 39 s
Description: Have you ever seen curd under a microscope? You can see dancing bacteria! Unicellular organisms are microscopic with a simple structure. Let's take a look at...

Question

Why formation of urine and its elimination is necessary in humans?

Accepted Answer

The purpose of making urine is to filter out waste products from the blood. Just as Carbon dioxide is removed from the blood in the lungs, nitrogenous waste such as urea or uric acid are removed from blood in the kidneys. It is then no surprise that the basic filtration unit in the kidneys, like in the lungs, is a cluster of very thin-walled blood capillaries. Each capillary cluster in the kidney is associated with the cup-shaped end of a coiled tube called Bowman’s capsule that collects the filtrate. Each kidney has large numbers of these filtration units called nephrons packed close together. Some substances in the initial filtrate, such as glucose, amino acids, salts and a major amount of water, are selectively re-absorbed as the urine flows along the tube. The amount of water re-absorbed depends on how much excess water there is in the body, and on how much of dissolved waste there is to be excreted. The urine forming in each kidney eventually enters a long tube, the ureter, which connects the kidneys with the urinary bladder. Urine is stored in the urinary bladder until the pressure of the expanded bladder leads to the urge to pass it out through the urethra. This process helps to maintain homeostasis in the body.

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