easy · MCAT bio-biochem
An electrophysiologist observes a neuron at its resting membrane potential of -70 mV. Upon stimulation, voltage-gated channels open, leading to a rapid influx of a specific ion that drives the membrane potential toward +35 mV.
Which ion is primarily responsible for this depolarization phase?
- Ca^2+
- K^+
- Cl^-
- Na^+
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