The excretor system

All waste and toxic substances from our body are expelled by the body’s excretory system.


The lungs, skin, and urinary system (formed by the urinary tract and kidneys) are the excretory device. In the same way, the colon is part of it, which is responsible for forming the stool, with the clusters that the body discards by the anus.

Urinary excretory system

The excretion mechanism of the kidneys is quite complex. These are two organs located at the bottom of the waist, on both sides of the body. They are reddish brown. The renal artery has the function of supplying toxin-contaminated blood to the kidneys. This blood is filtered by tiny chapter blocks, which make up each kidney. So these toxic substances stay in the kidney and turn into urins.


That hot yellow liquid, expelled by the sex organs, is the end result of the mixture of toxic substances, with water, mineral salts. Uric acid and urea. To reach the final outlet, the liquid travels a very particular path. It is transported from the kidneys to the bladder, through the urinary tract, which in turn are made up of the urethra, bladder and ureters. Through the latter, the urins formed in the kidneys circulate to the urinary bladder.

The urine is kept stored in that bag of elastic walls, called the urinary bladder, and there it stays piling up, until the instant of expulsion or urination process. But to keep it there and not come out all the time, there are the sphincters, which are muscles that close the bladder and do not let the urine escape.

The blood as it goes through these cleaning processes in the kidneys is returned through the renal vein, only loaded with carbon dioxide, moving immediately to the heart, passing through the vena cava and ends its path in the lungs.

Skin excretion

This system works by removing toxins by sweating out of the skin, when the temperature rises and the body works to cool down. Normally, we excrete half a liter of sweat per day, depending on the amount of exercise performed.
A compound between water and mineral salts, they make up that salty-tasting liquid called sweat. It is regulated by nerves, which determine the amount of fluid that is expelled by sweating. Sweat rises from sweat glands that spread throughout the body on the skin, especially on the hands, armpits, feet, and forehead.

Excretion by the lungs

It transforms the air we breathe, relating it to blood and then to tissues. Carbon dioxide is removed from the blood in the lungs, which remains after its previous process in the kidneys.
The excretor system is formidable, as it also regulates the amount of salts and water in the physical body, throwing the excesses to the outside and offering chemical balance to the whole machine. In this way, living beings can adapt to different weather conditions.

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The excretor system
Source: Education  
July 14, 2019


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