44. What is the excitation
threshold of a neuron? How
does this threshold relate to
the “all-or-nothing” rule of the
neural transmission?

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The excitation threshold of neuron is
the depolarization that must be
caused a stimulus to be
as a neural impulse. value is about
–50 .

The transmission of the impulse
along the neuronal obeys an
all-or-nothing rule: it happens with
maximum or nothing happens.
Always only when the excitation
is reached the depolarization
and the membrane reaches
maximum possible positive
polarization, +35 mV. Ifthe
excitationthreshold not reached
nothing happens.