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.
Facilitated diffusion is the way in which cells are able to import larger molecules through the cell membrane. The cell membrane is a barrier which surrounds all cells and only allows small and uncharged molecules to pass through freely. Larger molecules, such as glucose, require special transporting proteins. The transporters for glucose bind to glucose molecules and then facilitate their transfer into the cell. There are five different types of glucose transporters, named GLUT 1-5.