In which regions (marked as 1,2,3,4 and 5) would cells with many microvilli and mitochondria be found?
A) 1 and 5
B) 2 and 4
C) 2 and 3
D) 3 and 4
Correct Answer: C
Solution :
[c] 1 - Bowman's capsule: Mainly involved in ultrafiltration. This is a passive process that does not require an energy source like the mitochondria. 2 - Proximal convoluted tubule: The large surface area (microvilli) and mitochondria are adaptations for selective reabsorption of substances from the glomerular filtrate. 3 - Descending limb of the loop of Henie: Creates and maintains an increasing osmotic gradient for sodium, chloride and urea. 4 - Distal convoluted tubule: Brush borders and mitochondria in this site for the fine control of salt, water and pH balance of blood. 5 - Collecting duct.
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