1. PART 2
The Urinary System

2. Uriniferous Tubule Figure 23.5a
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

3. The Nephron Renal corpuscle Glomerulus and glomerular capsule
Glomerulus – tuft of capillaries
Capillaries of glomerulus are fenestrated
Glomerular (Bowman’s) capsule
Parietal layer – simple squamous epithelium
Visceral layer – consists of podocytes
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

4. Renal Corpuscle and the Filtration Membrane
Figure 23.6a
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

5. Renal Corpuscle and the Filtration Membrane
Figure 23.6c
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

6. Tubular Section of Nephron
Filtrate proceeds to renal tubules from glomerulus
Proximal convoluted tubule
Loop of Henle
Descending limb
Thin segment
Thick segment
Distal convoluted tubule
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

7. Micrograph through the Renal Medulla
Figure 23.7
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

8. Juxtamedullary nephrons
Classes of Nephron
Cortical nephrons
85% of nephrons
Juxtamedullary nephrons
15% of nephrons
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

9. Collecting Tubules (Collecting ducts)
Receive urine from distal convoluted tubules
Figure 23.8
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

10. Classes of Nephron Figure 23.9a
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

11. Microscopic Blood Vessels
Nephrons associated with two types of capillary beds (a portal system)
Glomerulus
Fed and drained by arterioles
Afferent and efferent arterioles
Peritubular capillaries
Arise from efferent arterioles
Low-pressure, porous capillaries
Absorb solutes
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings

12. Microscopic Blood Vessels
Vasa recta
Thin-walled looping vessels
Part of the kidney’s urine-concentrating mechanism
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings