How do the guard cells regulate the opening and closing of stomatal pores?

(N/A) The opening and closing of stomatal pores are regulated by the turgor pressure within the guard cells.
$1$. When water enters the guard cells through osmosis,they become turgid and swell.
$2$. Due to the specific orientation of cellulose microfibrils in the guard cell walls,the swelling causes the outer walls to bulge outwards,which pulls the inner walls apart,resulting in the opening of the stomatal pore.
$3$. Conversely,when water leaves the guard cells,they become flaccid and shrink.
$4$. This loss of turgor causes the inner walls to move closer together,thereby closing the stomatal pore.