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Function 1.Remove nitrogenous wastes 2.Maintain electrolyte, acid-base, and fluid balance of blood 3.Homeostatic organ 4.Acts as blood filter 5.Release.

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Presentation on theme: "Function 1.Remove nitrogenous wastes 2.Maintain electrolyte, acid-base, and fluid balance of blood 3.Homeostatic organ 4.Acts as blood filter 5.Release."— Presentation transcript:

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3 Function 1.Remove nitrogenous wastes 2.Maintain electrolyte, acid-base, and fluid balance of blood 3.Homeostatic organ 4.Acts as blood filter 5.Release hormones: calcitriol & erythropoietin

4 Diuretic- loose water; coffee, alcohol Antidiuretic- retain water; ADH Aldosterone- sodium & water reabsorption, and K + excretion GFR= 180 liters (50 gal) of blood/day liters are reabsorbed back into blood Excrete a protein free filtrate

5 HOW DO KIDNEYS FILTER BLOOD? (p 583)

6 The Urinary System

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8 urine blood filtration tubular reabsorptio n and secretion “refreshed” blood

9 ammonia urea uric acid

10 kidneys ureters urinar y bladde r urethra

11 From the original 1800 g NaCl, only 10 g appears in the urine Urine Water- 95% Nitrogenous waste: urea uric acid creatinine Ions: sodium potassium sulfate phosphate

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13 low blood volume high plasma solute concentration hypothalamus heart receptors

14 hypothalamus posterior pituitary antidiuretic hormone collecting ducts

15 reduced blood pressure and glomerular filtrate juxtaglomerular apparatus renin

16 reninangiotensinogen angiotensin I angiotensin II

17 Why do doctors ask for a urine sample? Urinalysis characteristics: smell- ammonia-like pH , ave 6.0 specific gravity– more than 1.0; ~ color- affected by what we eat: salty foods, vitamins

18 odor- normal is ammonia-like diabetes mellitus- smells fruity or acetone like due to elevated ketone levels diabetes insupidus- yucky asparagus--- Odor

19 pH- range ave 6.0 vegetarian diet- urine is alkaline protein rich and wheat diet- urine is acidic

20 Color- pigment is urochrome Yellow color due to metabolic breakdown of hemoglobin (by bile or bile pigments) Vitamins- vitamin C- bright yellow Infection- cloudy Color


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