Transport across membranes involves two different processes, i.e. active transport and passive transport. Active transport needed energy because the movement occurs against the concentration gradient while passive transport comprises simple diffusion and facilitative diffusion.
What do you mean by Membrane transport?
Membrane transport may be defined as the gesture of particles such as solutes across or via a membranous barrier that is made up of a lipid bilayer.
Water always moves from the region of low osmolarity to the region of high osmolarity. Other compounds migrate with respect to their properties and carriers proteins that mediate their transport.
It is the passive transport that allows the migration of polar charged, polar uncharged, and small polar molecules through the membrane. The process is spontaneous.
Therefore, it is well described above.
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