the excretory system controlling the internal environment
TRANSCRIPT
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THE EXCRETORY SYSTEM
Controlling the Internal Environment
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Gross Anatomy of System
• Pair of kidneys– Retroperitoneal
• Pair of ureters• Urinary bladder• Urethra
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Gross Anatomy
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Location of KidneysRetroperitoneal
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Retroperitoneal Location
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The Kidney
Cortex
Medulla
Calyx
PelvisUreter
Hilum
PapillaPyramid
Column
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Functions of Excretory System
• Regulate body fluids– Volume, pH, composition
• Remove metabolic wastes from blood• Control rate of RBC formation• Regulate blood pressure• Regulate absorption of calcium
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Nephron
Collecting duct
DCTPCT
Ascending tubuleDescending
Tubule
Bowman’scapsule
GlomerulusVasa recti
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The Blood Supply to the Kidney
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Renal Corpuscle
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Renal Corpuscle
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Podocyte and the Filtration Process
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Function of Renal Corpuscle
• Bowman’s capsule• Glomerulus
– Filtration of blood• Water• Electrolytes• Glucose• Urea
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Filtration Slits
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Nephron
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Tubules
Distal Tubule
Proximal Tubule
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Function of Tubules
• Reabsorption of glucose– Proximal convoluted tubule
• Reabsorption of water– PCT, descending tubule, collecting duct
• Reabsorption of salts– PCT, ascending tubule, distal con. tub.
• Reabsorption of urea– PCT, collecting duct
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Collecting Ducts
Cuboidal Epithelium lining ducts
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Nepron with Vasa Recta
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Function of Tubules
• Reabsorption of glucose– Proximal convoluted tubule
• Reabsorption of water– PCT, descending tubule, collecting duct
• Reabsorption of salts– PCT, ascending tubule, distal con. tub.
• Reabsorption of urea– PCT, collecting duct