Define antiport.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
In facilitated diffusion, when two different molecules or ions move across a membrane in opposite directions simultaneously through a transport protein, the mechanism is called antiport.
Example: The Na⁺/H⁺ antiporter exchanges sodium ions for hydrogen ions across the plasma membrane.
|
Transport Type |
Direction |
Example |
|
Uniport |
One molecule, one direction |
Glucose transporter |
|
Symport |
Two molecules, same direction |
Glucose-Na⁺ cotransporter |
|
Antiport |
Two molecules, opposite directions |
Na⁺/H⁺ exchanger |
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