Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
Which part of the loop of Henle is highly permeable to water?
descending limb
both descending and ascending limbs
ascending limb
neither descending nor ascending limbs
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What is the sequence of events for water reabsorption from the loop of Henle?
water exits descending limb and enters blood, ascending limb concentrates ions, water exits collecting duct
water exits descending limb and enters ascending limb, ascending limb concentrates ions, water exits collecting duct
water exits ascending limb and enters blood, descending limb concentrates ions, water exits collecting duct
water exits collecting duct and enters blood, descending limb concentrates ions, water exits ascending limb
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How does the countercurrent multiplier system help concentrate urine?
by losing water from the collecting duct
by setting up parallel flows of filtrate
by maintaining a water potential gradient along the collecting duct
by active transport of ions into the ascending limb
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Which part of the loop of Henle actively pumps ions out into the interstitial space of the medulla?
ascending limb
tip of the loop
none of the loop
descending limb
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What causes the movement of water out of the filtrate in the collecting duct?
low water potential in the surrounding tissues
high solute concentration in the filtrate
active transport of water
high hydrostatic pressure
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What is the main effect of pumping ions out of the ascending limb?
increasing water potential in the medulla
increasing blood flow to the loop of Henle
decreasing water potential in the medulla
decreasing urine concentration
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Why does the loop of Henle function as a countercurrent multiplier system?
the flows of ions are in opposite directions
the flows of water are in opposite directions
the flows of filtrate are in the same direction
the flows of filtrate are in opposite directions
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How does having a countercurrent system help concentrate urine?
by maintaining a steep water potential gradient
by losing more ions from filtrate
by decreasing water reabsorption
by reducing active transport of solutes
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The main sections of the loop of Henle in the order that filtrate flows through them are the limb and the limb.
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State 2 ways in which the loop of Henle is adapted to carry out its function of concentrating urine.
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