A Potassium Ion Gradient Is Set Up in the Malpighian

question 3

Multiple Choice

A potassium ion gradient is set up in the Malpighian tubules through an active transport process.As a result,potassium concentration is higher in the lumen of the tubules than in hemolymph.How would the potassium gradient affect water movement?

• A)Water would be forced out of the lumen of the Malpighian tubules through an osmotic gradient.
• B)The potassium gradient would have no effect on water movement.
• C)There would be a net movement of water into the lumen of the tubules.
• D)Water would be conserved,forming a hypertonic solution in the Malpighian tubules.

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