The Na+K+ pump is a complex pump, simultaneously pumping three sodium ions out of the cell and two potassium ions into the cell for each molecule of ATP split. This means that, apart from moving ions around, it also generates a potential difference across the cell membrane. This is called the membrane potential, and all animal cells have it.
The rate of diffusion of a substance across a membrane increases as its concentration gradient increases. Active transport stops if cellular respiration stops, since there is no energy.
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