9. Na* reabsorption is a(n) a. Active Active b. Active-Passive proeess while CI
ID: 3483677 • Letter: 9
Question
9. Na* reabsorption is a(n) a. Active Active b. Active-Passive proeess while CI reabsorption is a (n) process Passive Passive Bd. Passive-active)Riq lEni 10. Na* moves by from the filtrate into the epithelial cells of the proximal tubule. a. Active transportc. Diffusion iboo b. Na/K pump d. Pinocytosis ol uov 101bivonq l istism sidue bne //enB 11. Inhibition of the functions of the descending limb of the loop of Henle (the countercurrent multiplier) would result in a. b. c. d. Decreased water reabsorption Increased Na" reabsorption Decreased Na* reabsorption Increased water reabsorption 12. Water permeability in the collecting duct is varied by altering the number of aquaporins present in the membrane of those epithelial cells. a. True b. False 13. Pituitary secretion of stimulates formation of concentrated urine. a. Aldosterone b. Renin c. Antidiuretic hormone d. Angiotensin I 14. The ability of the kidneys to remove molecules from the blood plasma by excreting them in the urine is known as a. Glomerular filtration b. Renal clearance c. Micturation d. ReabsorptionExplanation / Answer
9. b. Active - Passive.
Na+ reabsorption is an active process and takes place via sodium-potassium ATPase pumps while chloride just passes down its concentration gradient via a passive process.
10. c. Diffusion.
Since the filtrate has a higher concentration of Na+ than the epithelial cells of the proximal tubule, so Na+ moves through diffusion to the epithelial cells.
11. a. Decreased water reabsorption.
The descending loop of Henle is highly permeable to water and so water is readily reabsorbed in this region. So Inhibition of the functions of the descending limb of the loop of Henle would stimulate decreased water reabsorption.
12.a. True.
Since aquaporins are water channels, so by altering the number of aquaporins in epithelial cells of collecting duct, water permeability in the collecting duct can be varied.
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