A Potassium Ion Gradient Is Set Up in the Malpighian

question 10

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

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