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. Movement of materials from an area of low concentration to a higher one. Requires the use of a protein carrier molecule and energy in the form of ATP.