KEYWORDS: Nervous Coordination
Action Potential
Axon
Depolarisation
Neurone
Neurotransmitter
Refractory Period
Repolarisation
Resting potential
Sodium–potassium pump
Voltage-gated channel
change that occurs in the electrical charge across the
membrane of an axon when it is stimulated and a nerve
impulse passes.
a process extending from a neurone that conducts action
potentials away from the cell body.
temporary reversal of charges on the cell-surface membrane
of a neurone that takes place when a nerve impulse is
transmitted.
a nerve cell, comprising a cell body, axon and dendrites,
which is adapted to conduct action potentials.
a group of chemicals (eg acetylcholine), released by
neurones. They diffuse across the gap (synapse) between
adjacent neurones and so pass an impulse from one neurone
to the next or between neurones and muscles.
Time period after an action potential when it is impossible
for a further action potential to be generated because inward
movement of sodium ions is prevented because the sodium
voltage-gated channels are closed.
return to the resting potential in the axon of a neurone after
an action potential.
the difference in electrical charge maintained across the
membrane of the axon of a neurone when not stimulated.
protein channels across cell-surface membranes that use ATP
to move sodium ions out of the cell in exchange for
potassium ions that move in.
protein channel across a cell-surface membrane that opens
and closes according to changes in the electrical potential
across the membrane.
KEYWORDS: Nervous Coordination
Action Potential
Axon
Depolarisation
Neurone
Neurotransmitter
Refractory Period
Repolarisation
Resting potential
Sodium–potassium pump
Voltage-gated channel