Question

Explain briefly secondary active transport?

Answer 1

Secondary active transport is a type of active transport that helps in moving two different molecules across a transport membrane by utilising energy in the form of ATP. This is done so by formation of electrochemical gradient by the primary active transport of Na+. Na+ is actively transported out of the cell creating a much higher concentration in extracellular region than the intracellular region. Two variations of secondary active transport exist: symport(same direction) and antiport(opposite direction). Secondary active transport is also referred to as ion-coupled transport.

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