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11 Cards in this Set

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Na+

The majority of the ions in the ECF along the membrane border are sodium ions

Ca2+

Calcium ions are also located mainly in the ECF along the membrane border of the axon

K+

These ions are located mainly in the ICF

CL-

Numerous chloride ions are found in the ECF

protein

There are numerous proteins found in the ICF of the a neuron


These proteins are negatively charged


This creates the negative characteristic of the ICF



Comparing the ECF and ICF of a neuron

ECF is slightly more positive

Transmembrane potential

difference in voltage between the ICF and ECF

Voltage difference of the ICF

-70mV = resting membrane potential

When positive ions enter the ICF from the ECF, the voltage measurement will be

-65 mV



When even more positive ions enter the ICF from the ECF, the voltage measurement will be

-45 mV

The change in voltage could go from

-70 mV to +35 mv