Quality — Primary And Secondary Active Transport Extra

Introduction Cellular life depends on the ability to move substances across the plasma membrane against their concentration gradient (from low to high concentration). This process, known as active transport , requires energy because it opposes the natural tendency toward diffusion (entropy). Based on the direct source of this energy, active transport is divided into two categories: Primary Active Transport and Secondary Active Transport . 1. Primary Active Transport Definition: The transport of molecules against their concentration gradient using energy directly from the hydrolysis of adenosine triphosphate (ATP).