QuestionSBA
QuestionChoice
A refractory period is the time from the initial depolarisation of the first action potential to the point at which a second action potential can be stimulated.
10005214
d
Refractory period
QuestionChoice
Conductance is a measure of ion channel activity. If more ion channels are present within the membrane, these channels' activity will increase. Therefore, the conductance will also be higher.
10005213
c
Through conductance
QuestionChoice
This occurs in a myelinated axon. The myelin will increase the speed of transmission of an action potential along the axon as the ions flow from one node to another. This causes depolarisation and opens voltage-gated sodium channels to produce another action potential.
10005211
a
Saltatory conduction
QuestionChoice
This happens in an unmyelinated axon. Differences in charges inside the axon will cause positive ions to flow forwards or backwards. These ions will move and depolarise the membrane. The depolarisation will open voltage-gated channels in that section of the membrane and cause an action potential. This will then trigger further action potentials in the next part of the axon.
10005212
b
Electrotonic spread
QuestionChoice
This refers to the net movement of small molecules from an area of high concentration to an area of low concentration and does not relate to action potentials.
10005215
e
Diffusion
Concept
Chapter
2693
3822
Membrane Potential
Topic
152
Neuroscience
13589
Which one of the following describes the propagation of an action potential in a myelinated axon?
a