12 Questions
What percentage of water is reabsorbed in the proximal tubule, which is non-regulated?
70%
What is the minimum volume of water that must be excreted in urine per day?
440 mL
What is the maximum osmolarity of urine?
1400 mOsm
In which part of the nephron is water reabsorption regulated by ADH?
Collecting duct
What percentage of water is reabsorbed in the distal tubules, which is regulated by ADH?
20%
What is the role of the medullary osmotic gradient in water reabsorption?
It facilitates water reabsorption
What is the main function of aquaporins in the descending loop of Henle?
To make the descending loop permeable to water
What is the primary role of urea in the nephron?
To generate the necessary osmotic gradient in the loop of Henle
What is the name of the capillaries surrounding the loop of Henle and nephrons?
Vasa recta
What is the direction of water movement in the descending limb of the vasa recta?
From the capillaries into the interstitial fluid
What is the primary function of the urea transporter A (UTA) in the nephron?
To transport urea from the filtrate to the peritubular fluid
What is the direction of fluid movement in the ascending limb of the vasa recta?
From the interstitial fluid into the capillaries
Review the functions of the descending and ascending loops of Henle in the nephron, including water and solute movement in response to osmotic gradients. Understand how the loops regulate osmolarity and solute concentrations.
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