CHAPTER30URINARSYSTEMwebctFEWSLIDES

CHAPTER30URINARSYSTEMwebctFEWSLIDES - CHAPTER 30...

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Unformatted text preview: CHAPTER 30 HOMEOSTASIS (b) Glomerular Filtration • Blood pressure forces Glomerular filtrate (G.F.) out of glomerulus • G.F. : • Water, Glucose, Ions, Amino acids, Vitamins, nitrogenous wastes, (no blood cells or proteins) • G.F. enters Bowman’s capsule Glomerulus Bowman’s Capsule • 180 liters (50 gallons) of G.F. formed each day • Most is reabsorbed • 1.2 liters of urine voided/day Glomerular filtrate Glomerular filtrate Bowman’s capsule (c) Tubular Reabsorption • Movement of G.F. out of renal tubule back into blood • Occurs all along length of renal tubule • Proximal convoluted tubule: - Major site of tubular reabsorption- ~ 60% of G.F. volume and nearly all glucose, amino acids, and vitamins are reabsorbed • Most reabsorption of solutes is by active transport • H 2 O follows passively • For most substances (except glucose): o Transport maximum or renal threshold Upper limit to reabsorption Tubular Reabsorption Renal Tubule Blood Vessel (d)...
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CHAPTER30URINARSYSTEMwebctFEWSLIDES - CHAPTER 30...

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