AP Biology : Understanding Water Balance

Study concepts, example questions & explanations for AP Biology

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Example Questions

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Example Question #11 : Excretory Physiology

Which of the following functions does antidiuretic hormone (ADH) serve?

Possible Answers:

Decreases water volume in the urine

Induces vasoconstriction and increases blood pressure

All of the choices

Increases water permeability of the collecting ducts

None of these

Correct answer:

All of the choices

Explanation:

ADH is a hormone that increases permeability to water in the collecting ducts and therefore increases water reabsorption from the urine. This decreases the volume of water in the urine. Additionally, it can induce vasoconstriction in high concentrations, which narrows blood vessels and thereby increasing blood pressure. 

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