Secondary Active Transport Official

Secondary active transport does not use ATP directly. However, it is entirely dependent on primary active transport to maintain the gradient that fuels it. The Two Main Types: Symport vs. Antiport

Secondary active transport is the at the bottom of that dam. As the sodium ions naturally want to flow back "downhill" into the cell (where their concentration is low), the transport protein captures that kinetic energy. It uses the momentum of the falling sodium ion to "carry" another molecule窶罵ike glucose or an amino acid窶蚤long with it, even if that second molecule is moving against its own gradient. secondary active transport