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?

Question

Quizplus · Accepted Answer

The higher concentration of potassium in the lumen of the Malpighian tubules creates a hypertonic environment. This means that there is a higher solute concentration in the lumen compared to the surrounding hemolymph. As a result, water will move by osmosis from the area of lower solute concentration (hemolymph) to the area of higher solute concentration (tubule lumen), leading to a net movement of water into the lumen of the tubules.

A Potassium Ion Gradient Is Set Up in the Malpighian