Concentration of sodium channel in nerve in per square foot is
1.6 x 10-5 to 1.9 X-2 per square foot 6.6 x 10-6 to 3.9 X-3 per square foot 1.6 x 10-6 to 1.9 X-3 per square foot 6.6 x 10-5 to 3.9 X-2 per square foot