What are some reasons that the diffusion process slows down?

Cause the sole reason for diffusion to occur is the presence of a concentration gradient. read more

Cause the sole reason for diffusion to occur is the presence of a concentration gradient. Even intuitively the 'rate of diffusion' is directly proportional to the difference in concentration as you move in space (spatial gradient of concentration). read more

The main reason a diffusion is so slow is because it is a passive process. It relies on the natural movement of molecules to function, and as such can take quite some time to complete. read more