Exam4_Spring '07_Practice

Exam4_Spring '07_Practice - 1) The loops of Henle are...

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a) ascending and descending limbs have different permeabilities. b) the amount of water conserved is related to the length of the loop. c) as urine flows in the loop, a concentration gradient is established in the medulla. d) as urine flows in the loop, it becomes more concentrated in the nephron. e) active transport in the ascending and descending limbs multiplies the concentration gradient. 2) Which of the following factors would decrease the glomerular filtration rate? a) a fall in plasma protein concentration b) an obstruction such as a kidney stone in the tubular system, which increases Bowman’s capsule hydrostatic pressure c) vasodilation of the afferent arterioles. d) two of these answers e) all of these answers 3) Aldosterone: a) stimulates Na+ reabsorption in the distal and collecting tubules. b) secretion is directly stimulated by renin. c) stimulates K+ secretion in the distal tubule d) both [a] and [b] above e) both [a] and [c] above 4) Vasopressin: a) induces the kidneys to produce a small volume of concentrated urine. b) is stimulated when the body fluids are hypertonic. c) is produced by the anterior pituitary. d) both [a] and [b] above e) all of these answers 5) The descending limb of the loop of Henle of a juxtamedullary nephron: a) actively transports NaCl out of the lumen into the interstitial fluid. b) is permeable to water. c) is always impermeable to water. d) both [a] and [b] above. e) both [a] and [c] above. 6) The ascending limb of the loop of Henle is where: a) NaCl passively leaves the tubular fluid down its concentration gradient. b) NaCl is actively transported into the interstitial fluid, leaving water behind because the tubular cells are not permeable to water. c) water leaves the tubular fluid down its osmotic gradient.
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This note was uploaded on 07/27/2011 for the course BIOL 3324 taught by Professor Ziburkus during the Fall '07 term at University of Houston.

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Exam4_Spring '07_Practice - 1) The loops of Henle are...

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