Post on 16-Jan-2016
Urinary System
Osmoregulation
• homeostasis of H2O and solutes (‘stuff’)– NaCl– NH3
– H2O
• regulate uptake and loss of fluids• regulate uptake and loss of solutes
Figure 25.5
Proteins
Ammonia
Nitrogenous bases
NH2
(amino groups)
Nucleic acids
Urea
Uric acid
Mammals, mostamphibians, sharks,some bony fishes
Birds and many otherreptiles, insects, landsnails
Most aquatic animals,including most bonyfishes
Amino acids
Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Figure 25.6_2
Renal cortex
Renal medulla
Ureter
Renal pelvis
The kidney
Figure 25.6_3
Bowman’s capsule
Tubule
Collectingduct
To renalpelvis
Branch ofrenal artery
Branch ofrenal vein
Renal cortex
Orientation of a nephron within the kidney
Renal medulla
Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Figure 25.6_4
Proximal tubuleGlomerulus
DistaltubuleCollectingDuct
Fromanothernephron
Bowman’s capsule
Arteriolefrom renalartery
Arteriolefrom glomerulus
Branch ofrenal vein
Loop of Henlewith capillarynetwork
Detailed structure of a nephron
Capillaries
1
3
2
Figure 25.8Bowman’scapsule
Blood
Nutrients H2ONaCl
Proximal tubule
Somedrugsand poisonsCortex
Medulla
Interstitialfluid Loop of
Henle
H2O
Filtrate composition
Reabsorption
Filtrate movement
Secretion
Distal tubule1
2 NaCl
NaCl
NaCl
UreaH2O
3K
H
Collectingduct
Urine (torenal pelvis)
H2ONaCl HCO3
H2O Salts (NaCl and others) HCO3
H
Urea Glucose Amino acids Some drugs
HCO3
H
Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Figure 25.8_1
Blood
Filtrate composition
Reabsorption
Filtrate movement
Secretion
Bowman’scapsule
Nutrients H2ONaCl HCO3
Proximal tubule
Somedrugsand poisonsCortex
Medulla
H
H2O
Salts (NaCl and others) HCO3
H
Urea Glucose Amino acids Some drugs
Figure 25.8_2
Reabsorption
Filtrate movement
Secretion
NutrientsNaCl HCO3
Somedrugsand poisonsCortex
Medulla
Proximal tubule
Interstitialfluid Loop of
Henle
H2O
NaCl
NaCl
NaCl
UreaH2O
Collectingduct
Urine (torenal pelvis)
Distal tubuleH2O
NaCl HCO3
1
3
2
H2O
H HK