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Chapter 20 Urinary System. Function Waste removal Maintains water and electrolyte balance Regulates pH.

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Presentation on theme: "Chapter 20 Urinary System. Function Waste removal Maintains water and electrolyte balance Regulates pH."— Presentation transcript:

1 Chapter 20 Urinary System

2 Function Waste removal Maintains water and electrolyte balance Regulates pH

3 Structure 2 Kidneys –Reddish brown –Bean shaped –Lateral to vertebral column –Structure Cortex – outer edge Medulla – internal tissue containing nephrons Nephrons – tiny tubules that allow kidneys to function

4 Structure Continued

5 2 Ureters – tube from each kidney to the bladder Bladder – holding tank Urethra – tube to the outside of the body

6 Urine Formation Nephrons –Regulate water and electrolyte concentrations –Remove waste from the blood

7 Urine Formation Continued Urine Content Not Found in Plasma –Urea – breakdown of amino acids –Uric Acid – by product of amino acid metabolism –High sulfate –High phosphate *All glucose is supposed to get reabsorbed *95% water

8 Water IntakeWater Output 60% = water 30% = moist food 10% = metabolism Regulated by thirst –Hypothalamus –Water loss = increase in extracellular osmotic pressure Thirst occurs at 1% of total body (or when the body is dehydrated by 1%) 60% = urine 6% = feces 6% = sweat 28% = evaporation from skin/breathing Regulated by urine production ADH (antidiuretic hormone) present

9 Electrolyte IntakeElectrolyte Output Food Beverages Metabolic reactions Salt cravings Sweat Feces Kidney and urine production Hormone aldosterone (controls water excretion)


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