Question

B) Cells of the PCT go through a great deal of mitosis. C) Contraction of the PCT moves filtrate through the tubule. D) This provides the energy needed to fight kidney infection. 5) What is the best explanation for the microvilli on the apical surface of the proximal convoluted tubule (PCT)? A) Their movements propel the filtrate through the tubules. B) They increase the surface area and allow for a greater volume of filtrate components to be reabsorbed. C) They hold on to enzymes that cleanse the filtrate before reabsorption. D) They increase the amount of surface area that comes in contact with the blood's plasma to help actively excrete toxins. 6) The thin segment of the nephron loop's descending limb A) helps to pack a greater number of nephron loops into a smaller space B) is easily broken and replaced often C) aids in the passive excretion of nitrogenous waste D) aids in the passive movement of water out of the tubule

Answer 1

Question 5- Option B- They increase the surface area and allow a greater amount of filtrate component to be reabsorbed

Reason- Microvilli present on the lining of the proximal convoluted tube (PCT) increases the surface area of the tubule 30-40 times for the reabsorption of the filtrate.

Question 6- Option D- Aids in the passive movement of the water molecules out of the tubule.

Reason- The thin descending loop of Henle is highly permeable to water but has low permeability towards urea and ions. In the thin descending loop the reabsorption of the water takes place via aquaporin 1.