So now, let’s move a little bit past
the stomach into the intestine.
The intestines will involve many
types of peristaltic type movements.
But they also have some mixing
movements that occur as well.
And these are called
These segmentation contractions
are these mixing process.
And the reason why is because a
peristaltic contraction would contract
and move it along, while these
contractions are having a number of
the contractions occurring
at the same time,
which moves the food stuff in both directions
rather than only in one direction.
So peristalsis in the intestine looks very
much like this where you have a contraction,
relaxation in front of it, just
like we did in the esophagus.
The last type of interesting
intestinal motility issue
is something called a
migrating motor complex.
These are very, very, very large
contractions that are coordinated
from the top portion of the intestine all
the way down to the lower intestine.
These are done kind of like house cleaning
to move things along in rapid progression.
Because if you can imagine,
these segmentation contractions, moving
things around and mixing them up
and even peristalsis allows for
some movement down the GI tract,
but every now and then,
you need a really big movement
that moves it for a larger degree.
And these are migrating