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 the movement of molecules across a membrane requiring energy to be expanded by the cell. <br /><br /> ACTIVE TRANSPORT REQUIRES ENERGY. <br /><br /> Passive transport is diffusion across a membrane requiring only random motion of molecules with no energy expanded by the cell.