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Excretory SystemPrinceton 7th Grade Science
Main Function• to collect waste products and remove them from
the body
• excrete: to get rid of
Main Parts• Kidneys
• Bladder
• Ureter
• Urethra
• Skin
Kidneys• Remove urea & other waste
products from the body
• Nephrons act as filters within the kidneys
• Kidney stones form as solid particles that may leave the kidneys & pass through the urinary tract—can be extremely painful!
Bladder
• muscular organ that stores urine until it is excreted by the body
Ureter• narrow tube that carries urine from a kidney to the
bladder
• one comes from each kidney to the bladder
Ureter with a tumor
Urethra
• small tube which allows urine to flow out of the body
Stent being placed in urethra Genetically-engineered urethra
Skin
• eliminates waste in the form of perspiration (skin)
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