“Nat!” ATP called out. “I have a deal for you. You’re going to flow inside anyway. But if you do it through this special door, you can drag Suzy along with you.”
“Yes,” ATP said. “But the types depend on how you pay for it. is direct—I burn my own cash (ATP). Secondary is indirect—I create a traffic jam of ions (like sodium) and then use their rush to drag other things along, either in the same direction (Symporter) or opposite (Antiporter).” what are the types of active transport
Just then, a sodium ion named Nat rushed by, moving down his concentration gradient—from high concentration outside to low concentration inside. Nat was full of potential energy. “Nat
The vesicle blinked. “What about me? I wrap around big molecules and bring them into the cell. Is that active transport?” But if you do it through this special
One day, a frantic glucose molecule named Gus arrived at the gate. Gus was vital for the city’s energy, but outside, there were very few of him, while inside Cytoville, there were already thousands. The laws of diffusion said he should never get in. Yet, the city was starving.
Later that night, ATP sat by the membrane, exhausted but content. A young vesicle floated by, curious. “So active transport is just moving things against the flow?” it asked.