1/20
purple
Name | Mastery | Learn | Test | Matching | Spaced |
---|
No study sessions yet.
what distance does action potential cover
long distance
how are the long distance signals transmitted
input zone
trigger zone
conducting zone
output zone
what is the input zone
part where incoming signals from other neurons are received
what is the trigger zone
part where action potential are initiated
what is the conducting zone
part than conducts action potentials in undiminishing fashion, often over long distances
what is the output zone
part that released a neurotransmitter that influences other cells
what does the cell specific pathway
generate a graded potential
where are na volted- gated channels found
in dendrites and the cell body and are thought to help relay signals in this region
where is the action potential conducted
at the axon hillock
what happened to the action potential will be conducted without further stimulation by what methods
contiguous conduction
saltatory conduction
what is continuous conduction
propagation of the action potential along every patch of membrane down the length of the axon
what happens when action potential is initiated in one part of a cell membrane
a self perpetuating cycle is initiated so that the action potential is propagated along the rest of the fibre automatically
instead of travelling along a membrane what does the action potential do
it triggers an identical new action potential in the adjacent area of the membrane
what is saltatory conduction
relevant to myelinated fibers
covered by myelin at regular intervals along the length of the axon
what is myelin made up of
80% phospholipids +20 % proteins which makes it an insulator
where is the only location where current flow can generate
the axonal membrane is exposed to ECF
what kind of distance is between two nodes of ranvier
it is short enough so local current can take place between an active node and the adjacent one
the electrical impulse jumps from node to node = saltatory conduction
rapid conduction compared to unmyelinated fibres (50 times faster for fibres of smaller diameter
what is magnitude
the amount of charges that are in movement
what does magnitude depend on
the difference in potential between the two elkecttrically charged adjacent areas and on the resistance to electrical charge movment between the two regions
what is the relation between the diameter and velocity
the larger the diameter of the fibre the higher the velocity
multiple sclerosis
loss of myelin- slows or blocks the propagation of action potentials → poor coordination, lack of sensation partial paralysis