Passive diffusion plays an essential role in oral absorption of drugs through the gastrointestinal tract, penetration across the blood-brain barrier to reach Central Nervous System disease targets, ...

Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration. This is due to the random movement of the ...

This does not require a supply of energy because diffusion is a spontaneous process. This occurs when molecules are moved across the cell membrane from an area where they are at a low ...