So you put the fat in
your digestive system.
We put some healthy
fats up there. right?
We put avocados and some
seeds and nuts and salmon.
That's the kind of healthy fat we
should all be gravitating towards.
But either way we're talking
about the dietary fat that we eat,
it's not water soluble.
Well, you know, we work
really hard in our body
to take things that aren't water
soluble and make them water soluble.
So this dietary fat
isn't water soluble.
So it moves through the
stomach as large droplets.
So take a look at our drawing.
You see you've got the liver,
the gallbladder, the stomach,
and then look at the stomach.
You've got some blobs in there.
So lipids or fats move mostly
undigested in your digestive tract
until they reach
your small intestine.
So I chew it up, saliva starts breaking
things up with enzymes in my mouth.
I swallow it, it goes into my stomach,
but the fats don't really get broken down
until they get in
to my intestine.
So let's zoom in on the space where
the bile duct and the pancreatic duct meet.
Before we do, try and
trace that on your finger
so you know exactly
what we're speaking about.
Okay, you're looking for the place where
the bile duct and the pancreatic duct meet.
Bile duct coming from up here, pancreatic
duct coming out of the pancreas, bingo.
So let's blow that up.
Now look at the ampulla.
Okay, the ampulla is
the sack or the dilation
where the bile duct and
the pancreatic duct meet.
Now, if I were you, if I wanted
to spend the best time studying,
get involved with the graphic,
put your finger on the screen,
put your pencil in your notes,
whatever you need to do.
But this is important because we'll
use these structures over and over again.
So what is the ampulla?
Well, it's the sack or the dilation
of the opening where that bile duct
coming down from above and the
pancreatic duct from the side meet.
Now, the sphincter is a muscular
constriction of the mouth of the ampulla.
Okay. So we talked
about the sphincter of oddi.
That's just like this one.
And then there's another personal sphincter
that I'm not going to show you on film
but sphincters have the ability
to clamp down and to loosen up.
So sphincter is the muscular
constriction at the mouth of the ampulla.
That's what controls the
bile and the pancreatic juices
into the duodenum.
So when you're
looking at the picture,
can you find all
Can you locate the ampulla?
Can you look at the
sphincter of oddi?
So now you've kind of
got an idea of all the things
that need to work together
when the gallbladder releases
what I want that sphincter
to be tight or to be open.
Well, if the gallbladder is
releasing bile into the duct,
I'm not going to want to stop, I'm
gonna want it to drain in the intestine.
So I'm going to
want it to relax.
See it's that sphincter of oddi
that surrounds the ampulla of Vater,
that's that small thing that
pokes into the intestine.
So that's where the bile
and the pancreatic juices flow.
If the gallbladder is releasing
it and it's flowing down,
I need that to be relaxed.
That's how the bile can enter the small
intestine through that muscular like valve.
So we've used repetition
again in this portion.
I want you to know, do you recognize
where the sphincter of oddi is?
Do you know what an ampulla is?
And do you know what response has to happen
to the sphincter when bile is released
in order for the food to start
to be digested in the intestine?
Okay, so we want to
show you this again.
I know, but repetition is a beautiful
thing when it comes to learning.
Look, we've got the
big picture for you there.
You've got the liver, the gallbladder,
the stomach, the pancreas,
and where it all comes
together in the small intestine.
So I want you to see that space
where the common bile duct
and the pancreatic duct meet
and drain into the small intestine.
Now, we've given you a
window into the intestine.
You don't really
have one of those.
That's just what you
see through the intestine
so you know what's
going on there.
The duodenum is where the stomach
empties into the small intestine,
but let's look at the
other parts of the gut.
Now note, the duodenum,
that's kind of the bluish color.
Now, look where the
jejunum is, that's in green.
And then we end
up with the ileum.
So the duodenum, the jejunum, and
the ileum make up the small intestine.
Those are just names for
three parts of the small intestine.
So where would the
stomach be in this graphic?
Knowing what you know and what
we've discussed about the anatomy,
I want you to
literally just draw it in
so you have clear in your mind where
the stomach would be in this drawing.
Now, let's take a look at the
duodenum and the rest of the intestines
because the question is, where does 90% of
the digestion and absorption of food occur?
Well, most of the end absorption
of nutrients and minerals from food
takes place in
the small intestine.
Usually people think it's
their stomach but it's not.
It's why the intestines
are so important.
90% of it in the small intestine,
the other 10% of it in the stomach,
and the large intestine.
They share that percentage.
So that's why the small
intestine is so important.
You'll see it there. We've
got it marked off for you.
The duodenum, jejunum, and the
ileum are all parts of the small intestine.
Then we've got the large
intestine and the rectum
which is just kind of a holding tank
for waste before it exits your body.