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· What is the purpose of the urinary system?

· collect waste produced by cells and removes the waste from the body

· What are some of the structures in the urinary system?

· kidneys, ureters, nephron, blader, urethra

· How does excretion relate to homeostasis?

· filters out more water when it is cold and you are hydrated, doesn't excrete as much water when it is hot and you are dehydrated, maintaining homeostasis

· How many nephrons does your body have?

· about a million

· What do the kidneys do?

· filter out waste

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