Anonymous asked in Science & MathematicsBiology · 9 years ago

what isprimary active transport?

1 Answer

  • Anonymous
    9 years ago
    Favorite Answer

    Proteins in the membrane can also act as pumps.

    Move ions or small molecules from low concentration to high concentration (i.e. up their gradients).

    Require cellular energy, usually as ATP

    Saturates when substance reaches high concentrations due to lack of available protein.

    Example: Na-K ATPase Present in nearly every cell in the body

    Pumps 3 Na ions out in exchange for 2 K ions pumped in (cost=1 ATP)

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