How an axon affects the relay of message if an axon has no myelin sheat?

Question

its all in the question

Answer 1

Action potentials will propagate, but much more slowly.

Answer 2

without myelin sheaths, the channels open every little way down the axon.  if you have myelin sheaths then the channels open at each node of ranvier creating a sort of jumping action potential from node of ranvier to node of ranvier causing a faster transmission.