sources: Cambridge Lower Secondary Science Stage 9 – Student’s Book, Our lovely science teacher ❤

Excretion

Excretion is when an organism gets rid of waste substances that it has made inside its cells. Excretion is one of the seven life processes that all living organism do.

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The excretory system

Here is a diagram to show how the excretory system works!

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Kidney problems

Sometimes, a person’s kidneys do not work very well because they have a disease. People with kidney disease often have proteins in their urine because the filters inside the kidney have been damaged. So, doctors test urine for peotein if they suspect a patient has kidney disease.

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