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What is the function of the excretory system?

to remove wastes from the body

How does the excretory system maintain homeostasis?

smooth muscle contractions that generate heat
-trapped by adipose tissue

3 types of excretion

-from skin
-from colon
-of fluid

Excretion from skin

sweat that contains salt (NaCl)

Excretion from colon

solid wastes (feces)

Excretion of fluid

formed in the kidneys

Function of Kidneys

filter wastes from blood by diffusion/osmosis and add water to form urine

Urine Flow

kidneys -> ureter -> urinary bladder -> urethra -> out of body
urethra and urinary bladder known as U-tubes

Functional unit of kidneys



structure that filters blood


machine that does the job of kidneys


deals with kidneys

Components of Nephron

-loop of henle
-collecting duct


location where blood is filtered

Loop of Henle

water moves in/out of nephron, forming urine

Collecting Duct

urine held here until released through ureter

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