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?

ascending limb

both descending and ascending limbs

descending limb

neither descending nor ascending limbs

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1

What is the sequence of events for water reabsorption from the loop of Henle?

water exits collecting duct and enters blood, descending limb concentrates ions, water exits ascending limb

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

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How does the countercurrent multiplier system help concentrate urine?

by maintaining a water potential gradient along the collecting duct

by active transport of ions into the ascending limb

by setting up parallel flows of filtrate

by losing water from the collecting duct

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1

Which part of the loop of Henle actively pumps ions out into the interstitial space of the medulla?

descending limb

ascending limb

none of the loop

tip of the loop

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1

What causes the movement of water out of the filtrate in the collecting duct?

active transport of water

high solute concentration in the filtrate

high hydrostatic pressure

low water potential in the surrounding tissues

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1

What is the main effect of pumping ions out of the ascending limb?

decreasing water potential in the medulla

decreasing urine concentration

increasing blood flow to the loop of Henle

increasing water potential in the medulla

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Why does the loop of Henle function as a countercurrent multiplier system?

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

the flows of ions are in opposite directions

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1

How does having a countercurrent system help concentrate urine?

by losing more ions from filtrate

by maintaining a steep water potential gradient

by decreasing water reabsorption

by reducing active transport of solutes

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1

The main sections of the loop of Henle in the order that filtrate flows through them are the limb and the limb.

descending
ascending

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2

State 2 ways in which the loop of Henle is adapted to carry out its function of concentrating urine.

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2