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11 Cards in this Set

  • Front
  • Back
_______ cannot occur along a _____, because myelin increase resistance to the flow of ions across the membrane
continuous propagation
myelinated axon
(saltatory propagation 1)
_____ can readily cross the membrane only at _____
ions
nodes
(saltatory propagation 2)
when an ______ appears at the _______ of a myelinated axon, the local current _____ the internodes and _______ the node closest to the threshold
action potential
initial segment
skips
depolarizes
(saltatory propagation 3)
_____ from node to node – saltatory propagation
jumps
node
saltatory
(saltatory propagation 4)
carries______ much more rapidly than _______ propagation
impulses
continuous
(saltatory propagation 5)
Myelination_____ coordination and control by decreasing the time between the _______ and the ______ of an appropriate response.
improves
reception of a sensation
initiation
(saltatory propagation 6)
_________ begins at the initial segment
action potential
initial segment
(continuous propagation 1)
the_______becomes ______ rather than negative
transmembrane potential
positive
negative
(continuous propagation 2)
a _______ then develops as ______ begin moving in the ______ and ______ – ________ propagation
local current
sodium ions
cytosol and the extracellular fluid continuous
(continuous propagation 3)
each time a local current develops, the ________ moves_______, not backward because the_____ is still in absolute refractory
action potential
forward
backward
previous segment
absolute refractory
(continuous propagation 4)
in _______ propagation, an action potential appears to _________ of a membrane in a series of______
continuous
move across the surface
tiny steps
(continuous propagation 5)