Cellular Homeostasis: Root Hair Cell & Villi Cell

How could regulation of substances in and out of cells results in cellular homeostasis? 

Root Hair Cell:

If the internal water potential decreases, the receptor will be stimulated. Water from the external environment which has a higher water potential will be absorbed by the root hair cell which has lower water potential through osmosis.








Villi Cell:

Concentration of nutrients from outside the villi cells is higher. Nutrients are being absorbed into the villi cells, which are structured in folds and thus increases the surface area to volume ratio and rate of absorption.