The process works as follows:
Think of a waterwheel. Primary transport creates a flowing river (the ion gradient). Secondary transport builds a mill on that river; the water’s flow (downhill) powers the grinding of grain (uphill solute movement). secondary active transport
Secondary active transport is a crucial mechanism for many cells, and there are several examples of its importance: The process works as follows: Think of a waterwheel
Outside (High Na⁺) → Na⁺ enters; Ca²⁺ exits ← Inside (High Ca²⁺) Secondary active transport is a crucial mechanism for
| Feature | | Antiport (Countertransport) | | :--- | :--- | :--- | | Direction | Both solutes move in the same direction across membrane | Solutes move in opposite directions | | Energy source | Downhill ion flow drives uphill solute in same direction | Downhill ion flow drives uphill solute in opposite direction | | Example | SGLT (sodium-glucose linked transporter) | Na⁺/Ca²⁺ exchanger (NCX) | | Also called | Cotransporter | Exchanger |
Outside (High Na⁺) → [Na⁺ + Glucose] → Inside (Low Na⁺)