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Urinary System - Urinary System Organs kidney(2 ureter(2...

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Urinary System Organs: kidney (2), ureter (2), urinary bladder (1), urethra (1) Functions 1. Elimination of chemicals a) “Wastes” = chemicals/materials that can be toxic even in small concentrations (nitrogen wastes) We need protein but protein has nitrogen that can be toxic so this nitrogen is eliminated Urea, uric acid, creatanine ammonia (NH 3 ), which is toxic b) “Excess” = mostly water, some electrolytes, glucose, medications/drugs, vitamins (mostly water-soluble like B and C), minerals, hormones (basis for pregnancy tests), etc… 2. Regulation: blood pressure (through urine-water loss), pH, water and electrolyte balance, etc. 3. Hormone production a) Renin blood pressure regulation; affects peripheral resistance (smooth muscle contraction) b) Erythropoietin: RBC production (red bone marrow) 4. Etc… Figure 19.5, pg. 679 Back wall of abdomen, deep to 11 th and 12 th ribs (ribs protect kidneys), surrounded by adipose tissue Only require half of one kidney Renal capsule
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