claim the interaction of motrin and robitussin can cause heart attacks in children
Active transport. Active transport is the movement of molecules across a cell membrane from a region of their lower concentration to a region of their higher concentrationâin the direction against some gradient or other obstructing factor (often a concentration gradient).
active transport. A kind of transport wherein ions or molecules move against a concentration gradient, which meansmovement in the direction opposite that of diffusion-or-movement from an area of lower concentration to an area of higher concentration.