<s>
Spike	B-Algorithm
potentials	I-Algorithm
are	O
one	O
of	O
the	O
action	B-Algorithm
potentials	I-Algorithm
,	O
which	O
occur	O
in	O
electrical	O
activity	O
of	O
smooth	O
muscle	O
contraction	O
in	O
animals	O
.	O
</s>
<s>
These	O
are	O
true	O
action	B-Algorithm
potentials	I-Algorithm
.	O
</s>
<s>
The	O
spike	B-Algorithm
potentials	I-Algorithm
last	O
10	O
to	O
40	O
times	O
as	O
long	O
in	O
gastrointestinal	O
muscle	O
as	O
the	O
action	B-Algorithm
potentials	I-Algorithm
in	O
large	O
nerve	O
fibers	O
,	O
each	O
gastrointestinal	O
spike	B-Algorithm
lasting	O
as	O
long	O
as	O
10	O
to	O
20	O
milliseconds	O
.	O
</s>
<s>
Conduction	O
of	O
nerve	B-Algorithm
impulse	I-Algorithm
,	O
depolarization	O
is	O
the	O
first	O
stage	O
of	O
conduction	O
.	O
</s>
<s>
During	O
cortical	O
reaction	O
in	O
fertilisationof	O
sperm	O
with	O
secondary	O
oocyte	O
spike	B-Algorithm
potential	I-Algorithm
reaches	O
above	O
+30	O
mv	O
(	O
millivolts	O
)	O
.	O
</s>
