18 Questions
What is the primary mechanism of water reabsorption from kidney tubules?
Passive transport
Which of the following solutes is typically transported by diffusion?
Glucose
What is the typical rate of urine output in a normal individual?
1 ml/min
What is the primary function of the renal tubule?
To reabsorb water and solutes from the tubular fluid
Which of the following transport mechanisms is influenced by the electrical gradient?
Diffusion
What is the name of the process where solutes are transported from their area of higher concentration to the area of lower concentration?
Diffusion
What is the primary driving force for water reabsorption in the proximal tubule?
Transcellular osmotic gradient
Through which route does water pass in the proximal tubule?
Through both transcellular and paracellular routes
What is the approximate percentage of filtered water reabsorbed in the proximal tubule?
65%
Which of the following solutes is osmotically most active?
Na+ and Cl−
What is the role of Na+ -H+ antiport in the proximal tubule?
It contributes to the transfer of Na+ from tubular fluid into the cell
What is the primary mechanism of water reabsorption in the proximal tubule?
Transcellular and paracellular pathways
What is the osmolality of the interstitial fluid in the proximal tubule?
293 mosm/L
What is the result of the accumulation of water in the interstitial space?
Increased hydrostatic pressure
Which part of the B-Loop of Henle is impermeable to water?
Ascending limb
What is the primary function of aquaporin 1 in the proximal tubule?
It forms water channels in the cell membranes
What is the percentage of filtered NaCl reabsorbed by the B-Loop of Henle?
25%
Why does the fluid in the terminal part of the descending limb become hypertonic?
Water moves out of the tubule to enter the interstitial space
Test your understanding of the mechanisms of ion and water regulation in kidney tubules, including sodium and water reabsorption. Learn about the crucial functions of the renal tubule in maintaining water and electrolyte balance. This quiz is designed for students of internal medicine and physiology.
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