directs the formation of the anterior-posterior axis of the embryo by controlling the flow of growth factors

directs the left-right axis through directing growth factors to one side of the embryo

controls the development of the dorsal half of the embryo

Is faster in small diameter neurons

Is faster in large diameter neurons

Varies proportionally with neuron axon diameter

Varies inversely with neuron axon diameter

Is independent of the axon diameter

Myelination allows significant leakage of ions along the neuron

Decreasing axon diameter slows the speed of action potential propagation 

Myelin totally prevents current leakage along a neuron

Increasing axon diameter slows the speed of action potential propagation

Myelinated neurons do not need to produce action potentials to boost the current

The way in which voltage-gated Na⁺ ion channels recover after a refractory period.

The way in which APs appear to skip from one node of Ranvier to the next

The regeneration of APs along the length of an axon

The unidirectional flow of current down the electrical gradient along an axon

The passive flow of current down an electrical gradient along the axon

They have a higher density of voltage-gated Na+ channels per unit of membrane surface

APs have to be produced less often because there is less leakage of electrotonic current flow

APs have to be produced less often because they use unsalted conduction

APs are produced more often because of the lower leakage of electrotonic current so that CV is faster

They have more voltage-gated Na⁺ channels per unit of membrane surface

Larger than that produced by a threshold stimulus - but bot twice the size of the latter AP

Produce no APs as the neuron would become refractory to such a strong stimulus

Larger by an unknown amount than the AP produced by a threshold stimulus

Produce the same-sized AP as that produced by a threshold stimulus

Produce no APs as the neuron would be absolutely refractory to such a strong stimulus

The 1-2 ms period immediately after an AP

The period after the first 1-2 ms after an AP

The active flow of current from a depolarised site on the axon to adjacent resting sites

The passive flow of Na+ ions and Cl- ions from open channels on the axon to closed channels

The passive flow of current from a depolarised site on the axon to adjacent resting sites