A physiologist is looking to quantify the charge transfer coefficient, Sk, about a nerve bundle that is being tested for a myelin sheath growth hormone. The nerve bundle itself is 1 micron in diameter...

A physiologist is looking to quantify the charge transfer coefficient, Sk, about a nerve bundle that is being tested for a myelin sheath growth hormone. The nerve bundle itself is 1 micron in diameter and 1 cm long. The myelin sheath is 0.3 microns thick with a conductivity of σo = 6.25 × 10⁻⁸. The physiologist puts a potential of 0–60 mV across the myelin and records the current. The data are shown below.

a. What is a representative value for Sk in this system?

b. Is the myelin sheath above the critical insulation thickness