Guard Cell Stomatal Slider
Guard cell Guard cell Stoma closed

Potassium ions (K⁺) inside guard cells Low

Low K⁺ (flaccid)High K⁺ (turgid)
K⁺ insideLow
Water potentialHigh
Turgor pressureLow
Pore apertureClosed
Closed: Low K⁺ → high water potential → water exits → flaccid guard cells → thick inner walls collapse inward.
Tip: Drag the slider to see how K⁺ influx drives water entry by osmosis, increasing turgor and opening the pore. Press R to reset.