Multiple choice Electrogenic pumps expels ______ Na+ ions for every _____ K+ ions. 3, 2 2, 3 3, 3 2, 2 Reveal answer Fill a bubble to check yourself A Correct answer Explanation The sodium potassium pump is an electrogenic active transport mechanism that expels 3 sodium ions out of the cell for every 2 potassium ions it brings in.