A Potassium Ion Gradient Is Set Up in Insect Malpighian

question 52

Multiple Choice

A potassium ion gradient is set up in insect 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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