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Sodium concentration outside the cell exceeds that inside by a factor of about:
A10
B20
C50
D90
Answer & Solution
Correct answer: A. 10
1. The gradient drives sodium inward when channels open.
2. The imbalance is roughly an order of magnitude.
3. That factor is 10.
_Source: OpenStax Anatomy and Physiology 2e, Chapter 12, The Nervous System and Nervous Tissue._
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