Question

Complete each statement by using the appropriate word or phrase from the list. Each label may be used more than once.

The countercurrent multiplier is a phenomenon that occurs in the____ duct and back into the nephron loop contributes significantly to the medulary osmotic gradient
vasa recta
a. nephron loop
b. urea
c. na
d. ascending limb
e. solutes
f. water
g. descending limb
h. vasa recta

Answer 1

The countercurrent multiplier occurs in the nephron loop, where urea and NaCl are moved to create the medullary osmotic gradient, allowing for urine concentration. The ascending limb reabsorbs NaCl, the descending limb is permeable to water, and the vasa recta recovers NaCl to the circulation.

The correct option is a. nephron loop

Step-by-step explanation:

The countercurrent multiplier is a phenomenon that occurs in the nephron loop. The movement of urea into the interstitial fluid from the collecting duct and back into the nephron loop contributes significantly to the medullary osmotic gradient. Additionally, NaCl is actively reabsorbed from the filtrate into the interstitial spaces in the ascending limb, while the descending limb is primarily permeable to water.

The recovery of NaCl to the circulation via the vasa recta helps maintain a high osmolar environment in the depths of the medulla. This system utilises the opposing flows and varying permeabilities of the descending and ascending limbs of the loop of Henle to concentrate urine.

The correct option is a. nephron loop