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. Definition. noun. A kind of transport wherein ions or molecules move against a concentration gradient, which means movement in the direction opposite that of diffusion â or â movement from an area of lower concentration to an area of higher concentration.he movement of a substance across a membrane from a region of its lower concentration to a region of its higher concentration against a concentration gradient, using energy. This energy is supplied through respiration using ATP. Mitochondria (cell organelles in the cytoplasm) control energy release.