The Net Transfer of Water Between the Interstitial Fluid and ICF

Question

The net transfer of water between the interstitial fluid and ICF across the plasma membrane
A) is mainly due to the difference in the osmotic force between the ICF and the interstitial fluid.
B) is controlled by the channel proteins in the plasma membrane.
C) is primarily due to the difference in the hydrostatic pressure between ICF and the interstitial fluid.
D) all these.
E) none of these.

Accepted Answer

The net transfer of water between the interstitial fluid and the intracellular fluid (ICF) across the plasma membrane is mainly driven by osmosis, which is the movement of water through a semipermeable membrane from an area of low solute concentration to an area of high solute concentration. This process is primarily influenced by the difference in osmotic force (osmotic pressure) between the ICF and the interstitial fluid, rather than by channel proteins or hydrostatic pressure differences.