Conduction speed is (or can be)enhanced by
A) myelin.
B) altering extracellular sodium concentration.
C) increasing the temperature.
D) altering extracellular potassium concentration.
E) myelin and increasing the temperature.

Question

Quizplus · Accepted Answer

Myelin increases conduction speed by enhancing insulation and reducing capacitative current leak. Increasing the temperature can also enhance conduction speed by increasing the rate of ion channel opening and closing. Therefore, the best choice is E, which includes both myelin and increasing the temperature. Altering extracellular sodium or potassium concentrations may affect action potentials, but is not necessarily a primary way to enhance conduction speed.

Conduction Speed Is (Or Can Be)enhanced by