It is limited by it's surface area.
The drug cyclosporine is usually given with a sperate injection of steroids to help keep the organ receiver from rejecting the organ during surgery.
Depednign on what the cell is trying to transport there could be a variety of ways for the cell to transfer materials.
If the item is small and np then it can go through the lipid bilayer.
Simple diffusion and facilitated diffusion are passive transport meaning the cell does not need energy to transfer the membrane
and active diffision means they need to spend energy.
you need transmembrane protiens to move things inside the cell
After you wash your hands with soap and water, it should be acceptable.
