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?

Question

Quizplus · Accepted Answer

The higher concentration of potassium ions in the lumen of the Malpighian tubules creates an osmotic gradient, causing water to move into the lumen from the surrounding hemolymph. This movement of water facilitates the removal of waste products from the insect's body. Therefore, there is a net movement of water into the lumen of the tubules.

A Potassium Ion Gradient Is Set Up in Insect Malpighian