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25 Cards in this Set

  • Front
  • Back
the brain consists of aproximately 100 billion nerve cells called?
neurons
specialized to carry and process info
neurons
neutrons are made up of what?
dendrites, soma, axons
info in neurons flow in what order?
dendrites, soma, axon
part of the neuron that specializes in receiving messages from other neurons
dendrites
part of the nerve cell that collects and combines incoming info
soma
the part of the nerve cell that carries info away from the cell body to other neurons
axon
bulb shaped parts that send info to other neurons and branch out into smaller fibers
axon terminals
electrically charged molecules that are involved in a nerve impulse
ions
can be found both inside and outside the nerve cell
ions
positive ions exist OUTSIDE the neuron and more negative ions exist INSIDE the neuron when the neuron is?
inactive
the electrical charge of an inactive neuron
resting potential
a neurons trigger point for firing
threshold
threshold occurs when what electrical charge occurs within a nerve cell
-50 millivolts
fastest neurons can send impulses at how many miles per hour?
200
conduction of a nerve impulse down the axon; when a neuron reaches its threshold
action potential
channels that transport sodium and potassium within the axon
ion channels
during an action potential, which ions do the molecular gates open to allow?
sodium
the ion channels first open near?
the soma
the fact that action potentials occur completely or not at all
"all or nothing event"
a nerve cell briefly dropping below its resting level
negative after-potential
negative after-potentials are caused by the outward flow of what ions from the axon?
potassium ions
whitish fatty substance that surrounds the axon and aids conduction of a nerve impulse down the axon
myelin
small gaps in the myelin help nerve impulses move _____ as they jump from gap to gap
faster
when the action potential leaps from gap to gap in the myelin layer
saltatory conduction