08 RENAL EXCRETION.pdf

PartPart 11 IntroductionIntroduction
ĉĉĉĉĉĉExcretionExcretion andand PathwaysPathways ofof ExcretionExcretion
Excretion:Excretion:
The most of metabolic waste
products and foreign substances is
excreted by some excreting ways .
PathwaysPathways forfor excretion:excretion:
• an
• Gastrointestinal tract
• Skin
• Kidney
FunctionsFunctions ofof thethe kidneys:kidneys:
°° ExcreteExcrete metabolicmetabolic wastewaste productsproducts
andand foreignforeign .
° RemainRemain thethe balancebalance ofof electrolyte,electrolyte,
pHpH andand osmoticosmotic pressurepressure ofof internalinternal
.
° EndocrineEndocrine function:function:
reninrenin ,, erythropoietinerythropoietin ,, kininskinins ,,
prostaglandinsprostaglandins
UrineUrine formation:formation:
• Filtration of glomerulus
• Reabsorption in the renal tubule
and collecting duct
• Secretion in the renal tubule
and collecting duct
FigFig UrineUrine formationformation
ĊĊĊĊĊĊ FunctionalFunctional AnatomyAnatomy
ofof thethe KidneysKidneys
. NephronNephron
renal
glomerulusglomerulus corpuscle
distaldistal proximal
tubuletubule tubule
renal
tubule
collecting
duct
loop
of Henle
cortical
nephron
juxtamedullary
nephron
Fig The structure
of nephron
afferent
efferent aeteriole
aeteriole
Bowman
glomerulus capsule
Fig 8-2 Structure of renal corpuscle