Excretion means to get rid of something. The excretory system gets rid of unwanted or harmful substances* in your body.
Digestion is completed in the stomach and small intestine. The undigested material that is left passes into the colon, where it is removed from the body.
Liquid waste from cellular respiration flows* through the blood system into
- sweat glands until it leaves the body as sweat
- the kidneys and is stored in the urinary bladder until it is expelled as urine.
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