Urinary System: Answers

1. #51 Kidney, PAS & Hematoxylin
   What is the functional significance of the occurrence of a brush border in the proximal tubule?  Expanded apical surface maximizes reabsorption.
2. #49 Kidney, Human
   What are the components of the arterial portal system of the kidney? Afferent arteriole, glomerular capillaries, efferent arterioles.
3. #1 Kidney, Rat, Iron Hematoxylin
   What is the significance of the differential distribution of mitochondria in the proximal versus the distal convoluted tubules?  Energy requirements greatest in the proximal tubule.
4. Lab question: What are the components of the blood urinary barrier in the glomerulus?
   endothelial cell cytoplasm (fenestrations)
   3 part glomerular basement membrane composed of collagen and polyanionic glycosaminoglycans
   slit-diaphragms extending from the podocytes

<<Back