A chloride channel has open-state conductance

PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Biophysics & Medical Physics · Molecular machines, transport and bioenergetics

Life at Thermal Energy, Ch The membrane: barrier, capacitor and pump

Problem

g = 8\,\mathrm{pS}

. The membrane potential is

V_m = -50\,\mathrm{mV}

and the chloride Nernst potential is

E_{\rm Cl} = -90\,\mathrm{mV}

. Model the open channel as obeying Ohm's law,

i = g(V_m - E_{\rm Cl})

. ((a)) Find the current

i

through the open channel, in pA. ((b)) Find the number of chloride ions crossing per second.

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