semipermeabiiliudesta
Semipermeability is a property of certain biological membranes, such as those found in cells, that allows the passage of some substances while restricting others. This selective permeability is crucial for maintaining the internal environment of cells, which is essential for their proper functioning. The semipermeable nature of cell membranes is primarily due to the presence of phospholipids, which form a bilayer structure. This bilayer acts as a barrier, preventing the free passage of large molecules and ions, while smaller, non-polar molecules can diffuse through the lipid bilayer.
In addition to the lipid bilayer, cell membranes also contain proteins that facilitate the transport of specific