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During an action potential the membrane potential rises to about:
A-70 mV
B+30 mV
C+70 mV
D-30 mV
Answer & Solution
Correct answer: B. +30 mV
1. Sodium rushing in reverses the charge.
2. At the peak, potassium channels start to open.
3. That peak is about +30 millivolts.
_Source: OpenStax Anatomy and Physiology 2e, Chapter 12, The Nervous System and Nervous Tissue._
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