This was the second type: . ATP didn’t push Suzy directly. Instead, he set up the conditions. Earlier, using primary active transport, ATP had pumped all the sodium ions out of the cell, creating a huge craving for sodium to get back in . That craving—that stored energy in the sodium gradient—was now the engine.
“See that?” ATP said proudly. “I use my own energy directly. I’m the battery that powers the pump.” what are the types of active transport
“No ticket, no entry,” ATP would grumble, crossing his arms. “And if you’re trying to go from low concentration to high concentration? Against the flow? Absolutely not. That’s illegal without a special pass.” This was the second type:
ATP opened a door, a channel with two seats. Nat sat down, eager to rush inward. Suzy reluctantly sat next to him. When ATP gave the signal, Nat’s natural rush down his gradient yanked Suzy along, dragging her up her own gradient into the cell. Earlier, using primary active transport, ATP had pumped