THE EXCRETORY SYSTEM Controlling the Internal Environment.
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THE EXCRETORY SYSTEM Controlling the Internal Environment
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Transcript of THE EXCRETORY SYSTEM Controlling the Internal Environment.
THE EXCRETORY SYSTEM
Controlling the Internal Environment
Gross Anatomy of System
• Pair of kidneys– Retroperitoneal
• Pair of ureters• Urinary bladder• Urethra
Gross Anatomy
Location of KidneysRetroperitoneal
Retroperitoneal Location
The Kidney
Cortex
Medulla
Calyx
PelvisUreter
Hilum
PapillaPyramid
Column
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
Nephron
Collecting duct
DCTPCT
Ascending tubuleDescending
Tubule
Bowman’scapsule
GlomerulusVasa recti
The Blood Supply to the Kidney
Renal Corpuscle
Renal Corpuscle
Podocyte and the Filtration Process
Function of Renal Corpuscle
• Bowman’s capsule• Glomerulus
– Filtration of blood• Water• Electrolytes• Glucose• Urea
Filtration Slits
Nephron
Tubules
Distal Tubule
Proximal Tubule
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
Collecting Ducts
Cuboidal Epithelium lining ducts
Nepron with Vasa Recta
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
