A key advantage of saltatory conduction is that A) more sodium ...

[newbem]

A key advantage of saltatory conduction is that
 
  A) more sodium ions have to be pumped out of the cell after an action potential.
  B) myelin allows the nerve cell to recycle neurotransmitter molecules.
  C) less transmitter is required to send a message across the next synapse.
  D) myelin speeds up the velocity at which an axon can conduct an action potential.
  E) myelin requires that nerve cell axons be larger in order to rapidly conduct a signal.

Question 2

Subthreshold depolarizations of the axon membrane
 
  A) are not conducted along the membrane.
  B) remain the same size at each point along the membrane.
  C) are just smaller versions of the action potential.
  D) decrease in amplitude as they sweep along the membrane.
  E) involve the closing of ion channels.

[Eunice618]

Answer to Question 1

Answer: D
Rationale: A key advantage of saltatory conduction is that myelin speeds up the velocity at which an axon can conduct an action potential.

Answer to Question 2

Answer: D
Rationale: Subthreshold depolarizations of the axon membrane decrease in amplitude as they sweep along the membrane.