Characteristics Of Active Transport !exclusive! Now

Fourth, it exhibits —all carriers have a maximum rate. Increase the concentration of the substance, and transport speeds up only until all pumps are busy. This differs from diffusion, which continues rising linearly.

Because moving substances against a gradient is not spontaneous, the cell must provide work. The primary source of this energy is Adenosine Triphosphate (ATP). In primary active transport, the energy is derived directly from the breakdown of ATP. In secondary active transport, the movement is fueled by the energy stored in an electrochemical gradient created by primary transport. Without a constant supply of energy, these transport systems would fail, leading to cellular dysfunction. Involvement of Specific Transmembrane Proteins characteristics of active transport