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Our body needs to eliminate waste and unnecessary materials and this is done by the excretory system.

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The kidneys clean the waste from our blood. This waste combines with water to make urine.

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Urine goes down two tubes called ureters, and collects in a bag called the bladder. Urine then leaves our body through the urethra.

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Our body also eliminates waste through the skin in the form of a liquid called sweat.

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We sweat when our body temperature rises.

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We have sweat glands that produce sweat all over our skin.

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Sweating cleans waste from our body and it also help us keep cool if we get too hot.