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A_UrinaryC - Urinary System Dr.S.C.Williams LifeArt1994 1...

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1 Urinary System-   Metabolic Waste Management Dr. S. C. Williams                     San Francisco State University Life Art 1994
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2 Introduction What is  excretion , secretion, elimination &  urination What products need excretion? What is the difference between an excretory & urinary system? What is the urinary system? Nephrons  -- 1 million / kidney 2 kidneys, 2 ureters, urinary bladder, urethra What is urine? Organs of excretion Kidney Sweat glands Lungs Colon Life Art 1994
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3 Clinical Importance Clinical diagnostic tests - urinalysis Dysuria – painful urination Hematuria – blood in urine Bacteriuria – bacteria in urine Pyuria – pus in urine Oliguria – scanty urine flow Polyuria – excessive urine flow Uremia – toxics accumulate in blood Enuresis – incontinence Nephritis – inflammation of kidney Urethritis – inflammation of urethra Cystitis – infection of urinary bladder Calculi  - stone formation
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4 Topics for Discussion Functions of the urinary system Waste products to be managed Kidney orientation and structure Nephrons and their structure Ureters Urinary bladder urethra development of urinary system Aging and the urinary system
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5 Functions of Urinary System Maintains  homeostasis by controlling the composition, volume, and  pressure of blood  Removes and restores selected amounts of water, solutes, & toxics Excretion of urea Role of liver Role of water Urine formation transport & storage Endocrine secretions  Renin  --  helps regulate blood pressure  Erythropoietin  --  stimulates production of red blood corpuscles
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6 What Wastes ? Metabolism produces cellular wastes CO 2, excess H 2 0, heat Nitrogenous wastes & toxics Ammonia Urea Excess electrolytes – sodium, potassium, calcium, etc Excess hydrogen ions Water
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7 Kidney Location and Orientation Inferior to diaphragm in superior  abdominal cavity Retroperitoneal – between 12 th   thoracic and 3 rd
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