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to be able to talk through where these
occur there are two different kinds of
approaches we could take the first
approach is the anatomical approach so
for this you take in food through the
mouth you'll swallow it into the
esophagus it'll go into the stomach and
then the small intestine large intestine
then out through the rectum if you
didn't utilize it or absorb it and I
like this anatomical viewpoint because
it gives us a very nice link to the
anatomy but in terms of function I think
it's better to start thinking about this
in terms of an engineering point of view
so let's take a look at what that might
look like
so this engineering tube viewpoint sets
up this type of system in kind of a
linear format we'll start off with
something like the teeth which will chop
up food we will end up adding liquid and
adding mucus to lubricate the system and
to get the food stuff along the
passageways we will have a portion of it
that helps blend or grind up the food as
well as provide a acid for undergoing
certain types of protein
characterization will have a certain
portion of this engineering tube that
will supply detergent a place in which
all those reactions can take place and
then we'll have a specific the specific
component that we'll add then enzymes to
undergo a lot of the different
macronutrient digestion but of course we
need to have a spot in which we can
absorb all of these particular macro and
micro nutrients finally to be able to
save water we need out of a place where
we can remove water and we can form
pellets so that of course we can get rid
of certain things that aren't necessary
so this is this engineering tube
viewpoint that we're going to revisit a
number of times as we introduce the
various components of the
gastrointestinal system and I think this
functional approach will really help
land what kind of things happen
what spot okay let's start linking the
two and that is the engineering and the
anatomical viewpoints let's start off
with where this detergent is added from
and that is done from the liver and from
the gallbladder so the liver is going to
produce various bile type substances
that are stored in the gallbladder and
then released into the small intestine
so that's where the detergent is coming
from the mouth and teeth provide this
kind of initial chopping and grinding of
food and why that's so important is
you're taking large particles making
them into smaller particles so there's
more surface area available to undergo
digestion but remember to be able to get
food down the GI system we need to make
sure that it has water added to it and
it also is lubricated and that's done
with the salivary glands finally the
stomach is the place in which we're
going to help blend and grind food a
little bit more and this is where acid
is added to the system finally it's your
pancreas that supplies the enzymes to
the small intestine and these enzymes
include everything from those are
involved with carbohydrates fats and
proteins the small intestine involves
the area in which most all of the action
is taking place for digestion and
absorption so these are where the
enzymes are acting on and where you
break these large molecules down into
small molecules so that you can absorb
them finally the large intestine is
where we remove some water and then
finally the rectum is of course where we
control what is released from the
gastrointestinal system
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