Answers

#51 Kidney, PAS & Hematoxylin

What is the functional significance of the occurrence of a brush border in the proximal tubule? The brush border increases the surface area, facilitating the reabsorption that occurs in the proximal tubule

What is the functional significance of the occurrence of a brush border in the proximal tubule? Expanded apical surface maximizes reabsorption

#49 Kidney, Human, H&E

What are the components of the arterial portal system of the kidney? Afferent arteriole, glomerular capillaries, efferent arterioles.

What are the components of the blood urinary barrier in the glomerulus? endothelial cell cytoplasm (fenestrations); three-part glomerular basement membrane composed of type IV collagen and polyanionic glycosaminoglycans; slit-diaphragms extending from the podocytes.