The Urinary System
Chapter 26
Introduction to the Urinary System
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3 Functions of the Urinary System
1.
Excretion:
▪
Removal of organic wastes from body fluids
2.
Elimination:
▪
Discharge of waste products
3.
Homeostatic regulation:
▪
Of blood plasma volume and solute concentration
Introduction to the Urinary System
▪
5 Homeostatic Functions of Urinary System
1.
Regulates blood volume and blood pressure:
▪
Adjusts volume of water lost in urine
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Releases erythropoietin and renin
2.
Regulates plasma ion concentrations
:
▪
Sodium, potassium, & chloride ions (controls quantities
lost in urine)
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Calcium ion levels (through synthesis of calcitriol)
Introduction to the Urinary System
▪
5 Homeostatic Functions of Urinary System
3.
Helps stabilize blood pH:
▪
Controls loss of hydrogen ions & bicarbonate ions in
urine
4.
Conserves valuable nutrients:
▪
Prevents excretion while excreting organic waste
products
5.
Assists liver in detoxifying poisons
