Transport — Define Active

Because this movement is "uphill" (moving from low to high), it cannot happen spontaneously. The cell must expend energy, usually in the form of , to power the process.

Think of it like a water wheel. You didn't lift the water to the top of the wheel (primary transport did that). You are just riding the water as it falls back down. define active transport

If passive transport is like rolling a ball downhill, active transport is like throwing that ball back up the hill—every single time. It requires energy, specialized machinery, and constant effort. Because this movement is "uphill" (moving from low