Bio 449Lecture 26 Renal Physiology IINov. 10, 2010 Nephrons (contd) Urine formation Glomerular filtration Proximal tubule Loop of Henle initial distal.
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Bio 449 Lecture 26 – Renal Physiology II Nov. 10, 2010
Nephrons (cont’d)Urine formationGlomerular filtration Proximal tubuleLoop of Henle & initial distal tubuleEnd distal tubule & collecting ductMechanisms of reabsorption and secretionCounter-current multipliersSummary of nephron function
Terms to KnowBowman's capsule Proximal tubuleLoop of HenleDescending limbThin ascending limbThick ascending limbDistal tubuleCollecting duct Glomerular filtrationGlomerular filtration rate (GFR) Tubular lumenApical or luminal membraneBasolateral membrane Counter-current multiplier
ReadingsLectures 25-27: Chapters 19 & 20
Nephrons
Secretion and reabsorption
Urine Formation
Overview of nephron function
Fig. 19-1
Collectingduct
Distal tubule
Afferentarteriole
Loopof
Henle
Efferentarteriole
Glomerulus
Peritubular capillaries
ProximaltubuleBowman’s
capsule
To renalvein
To bladder andexternal environment
KEY = Filtration: blood to lumen
= Reabsorption: lumen to blood
= Secretion: blood to lumen
= Excretion: lumen to externalenvironment
Glomerular filtration
Renal corpuscle
Fig. 19-5
Bowman’scapsule
Podocyte
GlomerularcapillaryLumen ofBowman’scapsule
Proximaltubule
Efferentarteriole
Afferentarteriole
Thickascending
limb ofloop ofHenle
Podocytes
Fig. 19-5
Renal corpuscle
Fig. 19-5
Lumen ofBowman’s
capsule
Podocytefoot
processes
Glomerularcapillary
Podocyte
Mesangialcell
Capillaryendothelium
Renal corpuscle
Fig. 19-5
Filtration slit
Basal lamina
Filteredmaterial
Foot processof podocyte
Lumen ofBowman’scapsule
Capillarylumen
Pores inendothelium
Proximal tubule
Loop of Henle & initial distal tubule
End distal tubule & collecting duct
Mechanisms of reabsorption and secretion
Counter-current multipliers
Summary of nephron function
Fig. 19-1
Collectingduct
Distal tubule
Afferentarteriole
Loopof
Henle
Efferentarteriole
Glomerulus
Peritubular capillaries
ProximaltubuleBowman’s
capsule
To renalvein
To bladder andexternal environment
KEY = Filtration: blood to lumen
= Reabsorption: lumen to blood
= Secretion: blood to lumen
= Excretion: lumen to externalenvironment
Summary of nephron function
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