Midnight, Texas â SERIES PREMIERE Based on Charlaine Harrisâ book series by the same name, âMidnight, Texasââ follows the lives of the inhabitants of a small town where the concept of normal is relative. A haven for vampires, witches, psychics, hit men and others with extraordinary backgrounds, Midnight gives outsiders a place to belong.
Facilitated diffusion. Definition. noun. Transport of substances across a biological membrane from an area of higher concentration to an area of lower concentration by means of a carrier molecule. Since the substances move along the direction of their concentration gradients, energy is not required.
Diffusion refers to the net movement of molecules from higher to lower concentration. Diffusion may be a simple diffusion or . A simple diffusion is one in which that occurs unassisted. Facilitated diffusion in contrast is an assisted diffusion in a way that it requires a carrier molecule. For instance, polar molecules diffuse across a cell membrane through carrier molecules in the cell membrane.