Question

Species	Outside (mM)	Inside (mM)	Permeability (m/s)
Na+	440	50	2x10-10
K+	20	400	2x10-8
Cl-	560	50	4x10-8

The giant squid axon has a diameter of 100μm, a membrane thickness of 7.5nm, and a specific membrane capacity of 1μF/cm2. Draw a schematic of the axon, local charge distributions, and indicate the electric field vector across the membrane at rest. Calculate the magnitude of the electric field across the membrane.

Answer 1