BIOL164Ch16NotesWin12

BIOL164Ch16NotesWin12 - Ch 16 The Urinary System = the...

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1 Ch. 16 – The Urinary System = the kidneys, plus some tubes and a bladder for urine transport, storage, and elimination Its fundamental purpose is to help maintain blood homeostasis The major excretory systems of the body Excretory = waste-removing Figure 16.1
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2 The functions of the urinary system • 1. Excretion and elimination of nitrogen-containing metabolic wastes such as urea, uric acid, and ammonia • 2. Regulation of the volume, pressure, and composition of blood : Regulation of blood volume and pressure , via: Regulation of water lost as part of urine Secretion of erythropoietin (EPO) to RBC production Secretion of the enzyme renin , which has many effects to blood volume and pressure Regulation of [plasma ions] such as Na + , K + , Cl - , Ca 2+ , etc. Regulation of blood pH , via: Excretion or conservation of H + and HCO 3 - (remember, HCO 3 - is a buffer) Conservation of valuable nutrients such as glucose, amino acids, etc.
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