Name ______________________________________________________
Date ______________ Period ______
Excretory System
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Why do our bodies need to filter waste from the body?
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Maintain homeostasis
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Removal of harmful materials
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Removal of excess fluids, chemicals, minerals, vitamins,
salts, and other wastes from the blood
Organs of the Excretory System
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Kidneys = filter
Blood that has collected wastes from cells
– Nephrons = filters
inside the kidneys
– Produce urine
(sterile waste fluid, 96% water)
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Ureters = tubes that
lead from each kidney to urinary bladder
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Urinary Bladder =
muscular organ that holds urine
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Urethra = tube that carries urine from the bladder out of the body
Review
Which is not a function of the excretory system?
1. Removes wastes from the blood
Kidney
2. Removes excess water from the blood
3. Removes carbon dioxide from the blood
Ureter
4. Removes excess salt from the blood
Other Excretory Organs
Urinary Bladder
Urethra
Review
Skin = releases perspiration (water and salts) to Cool off the body
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Lungs = release Carbon dioxide from the body
Review
Which system does not include an excretory organ?
Where is urine stored until the body is ready to eliminate it?
Urinary Bladder
Functions of Excretory System
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Rids blood of wastes ( urea )
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Controls blood volume by removing extra water
produced by cells
•
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Balances salts and water
so cells can function properly
Cardiovascular/Circulatory System