Urinary System

Osmoregulation homeostasis of H 2 O and solutes (‘stuff’) – NaCl – NH 3 – H 2 O regulate uptake and loss of fluids regulate uptake and loss of solutes

Figure 25.5 Proteins Ammonia Nitrogenous bases NH 2 (amino groups) Nucleic acids Urea Uric acid Mammals, most amphibians, sharks, some bony fishes Birds and many other reptiles, insects, land snails Most aquatic animals, including most bony fishes Amino acids

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Figure 25.6_2 Renal cortex Renal medulla Ureter Renal pelvis The kidney

Figure 25.6_3 Bowman’s capsule Tubule Collecting duct To renal pelvis Branch of renal artery Branch of renal vein Renal cortex Orientation of a nephron within the kidney Renal medulla

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Figure 25.6_4 Proximal tubule Glomerulus Distal tubule Collecting Duct From another nephron Bowman’s capsule Arteriole from renal artery Arteriole from glomerulus Branch of renal vein Loop of Henle with capillary network Detailed structure of a nephron Capillaries 1 3 2

Figure 25.8 Bowman’s capsule Blood Nutrients H 2 O NaCl Proximal tubule Some drugs and poisons Cortex Medulla Interstitial fluid Loop of Henle H2OH2O Filtrate composition Reabsorption Filtrate movement Secretion Distal tubule 1 2 NaCl Urea H2OH2O 3 KK HH Collecting duct Urine (to renal pelvis) H2OH2O NaCl HCO 3  H 2 O Salts (NaCl and others) HCO 3  H  Urea Glucose Amino acids Some drugs HCO 3  HH

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Figure 25.8_1 Blood Filtrate composition Reabsorption Filtrate movement Secretion Bowman’s capsule Nutrients H 2 O NaCl HCO 3  Proximal tubule Some drugs and poisons Cortex Medulla HH H 2 O Salts (NaCl and others) HCO 3  H  Urea Glucose Amino acids Some drugs

Figure 25.8_2 Reabsorption Filtrate movement Secretion Nutrients NaCl HCO 3  Some drugs and poisons Cortex Medulla Proximal tubule Interstitial fluid Loop of Henle H2OH2O NaCl Urea H2OH2O Collecting duct Urine (to renal pelvis) Distal tubule H2OH2O NaCl HCO 3  H2OH2O HH H K  