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Energy for primary active transport comes from ATP molecules. ATP is produced by the mitochondria. e.g. Na+/K+ ATPases are archetypal primary active transporters and they transport 3 Na+ ions out of cells and 2 K+ ions into cells by hydrolyzing one molecule of ATP. Energy for secondary active transport is stored in an established concentration gradient of ions across the cell membrane and drives transport with the tendency of ions to move from an area of high concentration to an area of lower concentration. e.g. Na+/glucose secondary transporters use the Na+ gradient (higher outside cells than inside) established by Na+/K+ ATPases to transport a molecule of glucose along with a sodium ion into cells.

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14y ago
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9y ago

An active transport uses cellular energy. Active transport moves a substance against its electrochemical gradient. The membrane spanning protein uses its energy source.

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12y ago

All celluar transport requires Adenosine triphosphate (ATP)

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11y ago

mitochondria

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13y ago

It uses membrane proteins as energy.

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14y ago

ATP

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Q: What source of energy is used in active transport?
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