Silence. Jamie slumped lower. The words were slippery, meaningless. Against the concentration gradient . It sounded like a hiking trail, not a law of nature. In Jamie’s world, things flowed downhill. Water ran to the sea. Heat left a coffee cup. Why would a cell bother to push a molecule the wrong way, against the flow?
Without active transport, your cells couldn’t maintain the right balance of nutrients, your nerves wouldn’t fire, and plants couldn’t get food from poor soil. It is the engine that keeps biological life organized and functioning. explanation of active transport
This is a bit more "clever." Instead of using ATP directly, it hitches a ride. It uses the energy created by a different molecule moving down its gradient to pull another molecule up its gradient. Both molecules move in the same direction. Antiport: The molecules move in opposite directions. Bulk Transport: Moving the Big Stuff Silence
That sodium wants to be in the water , Jamie thought. It’s more crowded outside the glass. It would be easy to just... dissolve. Float out. Downhill. Against the concentration gradient
A hand shot up. “Moving things across a membrane against the concentration gradient.”
Ever wonder how your cells move nutrients where they need to be, rather than where they naturally drift?