Question

hey everyone.....

here is my question....

why is excretion necessary

Answer 1

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Excretion is the removal from the body of waste products which result from normal life processes
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. Waste products such as carbon dioxide must be removed.
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If they are allowed to accumulate they cause poisoning which slows down vital chemical reactions.
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Answer 2

The excretory system is very important to your body and only has a few parts. In a similar way to removing solid waste from your body, you must also get rid of fluids. You know the results of the excretory system as urine. 
What do those kidneys do? The regulation process of body fluids and salt levels is also called osmoregulation. The kidneys act as a filter. Eventually all of the blood in your body passes through the kidneys and they are able to do their filtering magic. The kidneys pull harmful molecules out of your bloodstream and leave the ones that are good for you. 

The kidneys are also key players in the hydration (water) levels for your body. Let's say you are in the desert and you haven't been drinking much water. Chemical signals are sent to your kidneys to reabsorb as much water as possible. The result is less urine creation and your body loses less water. A normal day has you creating about one and a half liters of fluid.