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 of ions or molecules is achieved through the use of an integral membrane protein. Active transport is transport against a concentration gradient that requires chemical energy. Active transport moves ions or molecules in a specific direction through the use of an integral membrane protein. Think of these like different gates at the fair. There are three types of membrane proteins that use energy to push these substances against the concentration gradient.