alleryThe sodium-potassium pump moves 3 sodium ions out for every ___ potassium ions in.
AOne ion
BFour ions
CTwo ions
DThree ions
Answer & Solution
Correct answer: C. Two ions
1. The pump uses energy to keep the gradients.
2. It swaps sodium for potassium unevenly.
3. Three sodium out, two potassium in.
_Source: syllabus Biology, Chapter 21, Neural Control and Coordination._
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