factors affecting nerve impulse Flashcards
what factors affect the speed of nerve impulses
Myelin sheath
Un myelinated
Diameter of axon
Temprature
Does having a myelin sheath increase or decrease the rate of conduction
Increase
Why does it increase the rate of conduction
Because it provides electrical insulation meaning action potential jumps from one node of rangier to another
What is this jumping called
Saltory conduction
What does unmyelinated do to the rate of conduction
Decrease
how does the axon being unmyelinated affect the speed of nerve impulse
depolerisation has to occur along the whole of the axon
what else effects the speed of nerve impulse
diameter of axon
the greater the diameter the ….
faster the impulse
how does the diameter of the axon being bigger increase the speed
the greater the diameter the faster the conduction meaning there is less leakage of ions
what does a higher temp do to the speed of the action potential
increase
how does a higher temp lead to an increase in action potential
faster rate of ion diffusion
what is the rafactory period
where no new action potentialcan be produced
why can no new action potential be created
as sodium volatge gatted channels can’t open
why is the refractory period necessary
allows action potential to travel in one direction
what else does the refractory period do the impulses
limits the frequancy of impulses
