Concentrated urine

Question 1

Substrate from the cortical nephrons is absorbed into the..

Answer 1

Peritubular capillaries

Question 2

Substrate from the Juxta-medullary nephrons is absorbed into the..

Answer 2

Vasa Recta

Question 3

What does the loop of henle allow the animal to produce?

Answer 3

Loop of Henle enables formation of a hypertonic medullary interstitium

Question 4

How does the loop of henle exchange substrate into the vasa recta?

Answer 4

using countercurrent multiplier & countercurrent exchange,
maintained by close association with vasa recta

Question 5

What is the movement of ions and water like in the vasa recta?

Answer 5

Descending limb of vasa recta: As blood in capillary descends through areas of HIGH osmolarity (i.e. medullary interstitium) water diffuses out of capillary and NaCl diffuses in
Ascending limb of vasa recta As hypertonic capillary fluid ascends towards cortex, solute diffuses out and water back in