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This quiz contains 11 questions from a mix of 1 subtopics.
How does binding of ADH to its receptors in the distal convoluted tubule lead to increased water permeability?
blocking of urea transporters
widening of water channels already present
insertion of aquaporin channels into the membrane
activation of aquaporin channels already present in the membrane
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What does ADH binding initially cause, that leads to increased water permeability of cells in the distal convoluted tubule?
increasing mitochondrial activity
activation of cyclic AMP
activation of ion channels
stimulating protein breakdown
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What is the role of aquaporins in water reabsorption in the kidney?
to activate phosphorylation enzymes
to facilitate movement of water by osmosis
to initiate nerve signals to the hypothalamus
to bind ADH to cell receptors
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In the kidney, which cells have ADH receptors on their surface?
(Select all that apply)
cells lining the distal convoluted tubule
cells lining the loop of Henle
cells lining the collecting duct
cells lining the proximal convoluted tubule
cells lining the Bowman's capsule
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What is the effect of low blood water potential on urine volume and concentration?
larger volumes of more concentrated urine are produced
smaller volumes of more concentrated urine are produced
larger volumes of more dilute urine are produced
smaller volumes of more dilute urine are produced
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How does excess water intake affect urine concentration?
urine output decreases and urine becomes more dilute
urine output increases and urine becomes more concentrated
excess water has no effect on urine concentration
urine output increases and urine becomes more dilute
urine output decreases and urine becomes more concentrated
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Where are the osmoreceptors located that detect changes in blood water potential?
adrenal gland
hypothalamus
medulla
posterior pituitary gland
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How does a decrease in blood water potential affect ADH release?
ADH release remains unchanged
release of ADH from the posterior pituitary gland decreases
release of ADH from the posterior pituitary gland increases
release of ADH from the hypothalamus decreases
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ADH is transported to the posterior gland for storage after initial production in the .
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An increase in blood water potential is detected by in the hypothalamus, prompting a in ADH release.
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Describe the mechanism by which ADH increases water reabsorption in kidney tubule cells.
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