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myelin consists mainly of _______, and produces the visual effect behind _____ _____ in the CNS
threshold, voltage gated sodium
lipids, white matter
a ligand gated ion channel
neurilemma, forming the myelin sheath
central/ peripheral; somatic/ autonomic
rate of impulses or number of neurons carrying them
fixed anions and differential concentrations of potassium and sodium ions
influx of calcium ions
release of neurotransmitters, via fusion of vesicles with the cell membrane, is triggered by
threshold, voltage gated sodium
lipids, white matter
a ligand gated ion channel
neurilemma, forming the myelin sheath
central/ peripheral; somatic/ autonomic
rate of impulses or number of neurons carrying them
fixed anions and differential concentrations of potassium and sodium ions
influx of calcium ions
the 'strength' of a signal in the nervous system is modulated by _________
threshold, voltage gated sodium
lipids, white matter
a ligand gated ion channel
neurilemma, forming the myelin sheath
central/ peripheral; somatic/ autonomic
rate of impulses or number of neurons carrying them
fixed anions and differential concentrations of potassium and sodium ions
influx of calcium ions
oligodendrocytes in the CNS perform the same function as _______ cells in the PNS, namely ____
threshold, voltage gated sodium
lipids, white matter
a ligand gated ion channel
neurilemma, forming the myelin sheath
central/ peripheral; somatic/ autonomic
rate of impulses or number of neurons carrying them
fixed anions and differential concentrations of potassium and sodium ions
influx of calcium ions
if the receptor on the post synaptic cell responds to binding of its cognate neurotransmitter by opening itself to the passage of ions, it is...
threshold, voltage gated sodium
lipids, white matter
a ligand gated ion channel
neurilemma, forming the myelin sheath
central/ peripheral; somatic/ autonomic
rate of impulses or number of neurons carrying them
fixed anions and differential concentrations of potassium and sodium ions
influx of calcium ions
The nervous system can be divided anatomically into the _____ and _____; and functionally into the ____ and ____
threshold, voltage gated sodium
lipids, white matter
a ligand gated ion channel
neurilemma, forming the myelin sheath
central/ peripheral; somatic/ autonomic
rate of impulses or number of neurons carrying them
fixed anions and differential concentrations of potassium and sodium ions
influx of calcium ions
when the resting potential of the membrane rises to about -55mV, it reaches _________, and ______ channels open, further depolarizing the membrane
threshold, voltage gated sodium
lipids, white matter
a ligand gated ion channel
neurilemma, forming the myelin sheath
central/ peripheral; somatic/ autonomic
rate of impulses or number of neurons carrying them
fixed anions and differential concentrations of potassium and sodium ions
influx of calcium ions
the resting potential is due to
threshold, voltage gated sodium
lipids, white matter
a ligand gated ion channel
neurilemma, forming the myelin sheath
central/ peripheral; somatic/ autonomic
rate of impulses or number of neurons carrying them
fixed anions and differential concentrations of potassium and sodium ions
influx of calcium ions
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