Primary Active Transport And Secondary Active Transport

The "driver" ion and the "passenger" molecule move in .

Since the energy comes from letting an ion move down its gradient (e.g., Na⁺ rushing back into the cell), the coupled molecule can move either in the same direction or the opposite direction. primary active transport and secondary active transport

This is arguably the most important membrane protein in animal biology. It maintains the electrochemical gradient essential for nerve transmission and muscle contraction. The "driver" ion and the "passenger" molecule move in