Biology Forums - Study Force

Which of the following does NOT act to maintain the
  osmotic gradient necessary for the concentration of
  urine in mammals?
  a. countercurrent flow at the loop of Henle
  b. decreased hypothalamic signals leading to a
  decrease in ADH production
  c. impermeability of the descending limb of the
  loop of Henle to Na+, Cl-, and other solutes
  d. impermeability of the ascending limb of the loop
  of Henle to water
  e. all of these

Question 2

The process during which potassium and hydrogen
  ions, penicillin, and some toxic substances are put
  into the urine by active transport is
  a. tubular secretion.
  b. reabsorption.
  c. filtration.
  d. countercurrent multiplication.
  e. diffusion.

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The fact that I can't marry you for this saddens me.

Let's keep this professional  :monkey: