Difference Between Primary Active Transport And Secondary Active Transport -

Secondary active transport does not use ATP directly. Instead, it harnesses the energy stored in an electrochemical gradient created by primary active transport.

Active transport: primary & secondary overview (article) - Khan Academy Secondary active transport does not use ATP directly

| Feature | Primary Active Transport | Secondary Active Transport | | :--- | :--- | :--- | | | Direct hydrolysis of ATP. | Energy stored in an electrochemical gradient (created by primary transport). | | Dependency | Independent; creates its own gradient. | Dependent; relies on a gradient established by primary transport. | | Carrier Protein Type | ATPase enzymes (they break ATP). | Co-transporters (Symporters and Antiporters). | | Molecule Movement | Moves a specific ion against its gradient. | Moves one molecule down its gradient to drive another against its gradient. | | Classic Example | Sodium-Potassium Pump (Na+/K+-ATPase). | Sodium-Glucose Symport (SGLT). | | Metabolic Cost | High direct energy cost. | High indirect energy cost (requires the primary pump to be running). | | Energy stored in an electrochemical gradient (created

The primary difference between and secondary active transport is the source of energy used to move substances against their concentration gradient. | | Carrier Protein Type | ATPase enzymes (they break ATP)