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 is a method of cell transport that requires energy. Energy is expended because the cell has to move materials from an area of low concentration to an area of high concentration. Imagine you have 5 large marshmallows in your mouth.