Our body produces waste substances that can make us ill.
Blood is continuously collecting waste from all parts of the body.
For this reason, blood has to be cleaned.
Excretion is the process in which blood is cleaned and waste substances are eliminated.
The excretory system is responsible for this process.
The kidneys are the organs that filter blood and remove waste substances from it.
They produce urine, which is a mixture of waste substances and water.
Urine is stored in the bladder until it is expelled from the body.
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| Excretory (Urinary) System, from Wikipedia. |
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| Excretory System, from Wikipedia. |
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