Hi again, it’s Kelly from the everyday
home school. Today I’ve got a great demonstration of the human body
digestive system that I know you’re gonna want to do with your kids. I’m
gonna show you how to do it exactly the way I did it teaching it at our
homeschool co-op, so stay tuned you’re going to want to learn how to do this
with your kids! Okay before we get started let me show
you exactly what you need as far as supplies go. The first thing you’re gonna
need to represent the mouth is a really big bucket or a large bowl. This is one
that I use when I’m canning so this is this one worked great but it can be a
little smaller if you need it to be. You’re going to need some vinegar. Any
kind of vinegar will do. This will represent the hydrochloric acid in the
stomach. You will need some water. Any kind of water, it can be tap water. You’ll
use it twice. It will be for the saliva in the mouth and also for the drink of
water that is taken with the meal. You’re gonna need some cheap knee-hih pantyhose. I
got this for like 86 cents at a really cheap department store. You need two of
them. I only have one to show you right now cuz I used the other one previously
in the demonstration. But you will need two. You’re going to need a dryer ball.
This is a wool dryer ball. Anything of similar size and texture will also work.
A plastic bag, preferably the freezer kind of bag because this
is the stomach and you’ll be mushing up lots of food in here. I used a paper
towel tube to represent the esophagus. You can use any similar size tube that
works for you. The spoon represents the tongue. You will need a large glass jar.
This is the one that I had but it doesn’t have to be like this. Even just
like a quart size canning jar could work. You’ll need some plastic cups. These are
nine-ounce cups. You’ll need a couple pipettes. They can be the cheap plastic
kind. I just happen to have some really nice glass ones. You’ll need some red-
there it is-red food dye. And then the meal. For the meal I used a banana, a
piece of bread, and a couple stale cookies that I had on hand that day. So
this is what you need right here. I teach at a co-op once a week for our
homeschool group, our local homeschool group. My kids love it. They really enjoy
going. They’ve got some fun classes this year. I am teaching human body systems
for second through fifth graders so we have a wide age span
and different abilities and interests, but this activity that I did with them
was super fun. Unfortunately, only five of our 15 students were present that day
because the flu has been so bad in our area. It’s just been rampant. We have been
lucky so far. None of us have had it yet. So knock on wood! I hope that we don’t
get it. Anyway, I did upload the videos that I
took of the demonstration itself so that my students could see it on our home
school webpage and they’ll get to take a look at it there. You can see it now and
try it at your home with your kids or at your homeschool co-op as well. Okay these
are scissors, right? And they’re going to represent your teeth. Remember the name
of your teeth that are for cutting and tearing food? Starts with an I. Who remembers? In…cisors. Remember that word? So here’s my incisors. We are going to cut up my meal. My incisors have done their job. They’ve cut up the food a little bit. But I have more teeth in my mouth that are gonna help mush up the food a little better. Ok, I need Carter to come up here. Now what are the teeth called in the back of your mouth that are flat? (molars) Yeah, they’re flat. So these are going to be like- oops. Don’t stand on this side of the camera. Can you stand on this side? Thanks. These are going to be like the molars in the back of the mouth. Are you guys listening? These are like the molars in the back of your mouth and they’re going to mush up the food While he’s mushing the food, you are gonna add saliva okay?
The salivary glands in your mouth slowly add a little bit of, we’ll call it juice,
to the meal, right? They help mush it up. It’s just water. It’s still kind of hard
to swallow, so what do you do while you’re while you’re eating? When your
foods kind of dry and you get a lot of it in your mouth do you take a…? You take a
drink right? So let’s give our mouth a drink. This is our mouth by the way this
is where we’re chewing up our food, right so let’s give our mouth a drink.
Oh there that helps doesn’t it? There now do you think it’s going to be easier to chew that up a little bit better? Probably. Now it’s a little bit easier to chew. Ah…this is starting to look pretty! Yeah, can you hear that? This is why you don’t chew with your mouth open. Cause nobody likes that! Kay, how’s it looking now? EW!! UGH! Ok. Now from our mouth, where does our food go? Before it reaches our stomach, it has to reach our stomach, right? It’s gonna go down our esophagus. Let’s see, uh,
Stetsan are you- Oh Leah. You’re still Chewing. We’ll let her come on up. This is gonna be like our esophagus. It’s
a paper towel tube and it’s gonna go straight into our stomach. So this is
gonna represent our tongue. It helps push food into our esophagus. So you go ahead
and spoon some of that down the esophagus.
down the hatch, right? Where is it landing? now I’m gonna show you in a minute your
food doesn’t actually drop down tube into your stomach.
welcome yeah so here’s our stomach with with the partially chewed food which is
called chyme, and we’re gonna add some stomach acid to our bag to represent the
acid in your stomach. Okay this is vinegar, all right, I’m just adding
vinegar but it’s going to represent acid in your stomach. Oh, before I do that though let me let me
show you something. Remember I was telling you that your stomach- the food
doesn’t drop into your stomach straight down a tube, right? Something happens
called peristalsis. So let’s imagine that this is your esophagus and this is your
bite of food that you have just swallowed. Okay now there are muscles in
your esophagus, they’re smooth muscles and you don’t have control over them. You
can’t make them work. They work all by themselves without you even thinking
about it. So when you take a swallow when you swallow your food your muscles
in your esophagus start to squeeze like this and then they keep squeezing and
squeezing and squeezing your food down to your stomach. Yeah I’m gonna share
this with the class. I’m gonna upload it. Okay so that is how your food gets from
the top of your esophagus down into your stomach. And what’s it called?
What was that called? Peristalsis. This is peristalsis. That action of squeezing
food down your esophagus. Okay so here we are. Food’s in the stomach. We’re gonna add
some acid I don’t know we’re not gonna do that I’m
all healthy though so that’s it it’s super acidic in your stomach all right
and now your stomach is also made of smooth muscle and it works all by itself
without you thinking about it. Who wants to squeeze the food? One of you boys want to come try it? I’ll Let Ruby come do
it. Ruby come squeeze the food. This is your stomach mushing up the food. Does that feel slimy? Hold it down a little lower. There you go. So we’re mushing up
the food. Turn that way so they can all see it – this is what your stomach
does. Mashes up your food for you. And what do you think that acid does to your food? It helps break it
down. Why does your body need to break down all the food so so finely?Why do
you think? Why do we eat food other than it tastes good? Right. So energy and
nutrients. Right, your body can absorb all that energy and nutrients much more
easily if it’s digested. Okay so thank you Ruby. Here we have stomach
yummies all right this is partially digested this is still called chyme.
Where does your food go from here? Does it stay in your stomach forever? The next
stop is the small intestine. Okay so small intestine is next. Let me get
out my small intestine. Okay now we’re gonna use another sock. We’re gonna
pretend that this is now your small intestine. That’s okay it’s why I bought them. Let’s see who hasn’t helped yet that wants to help? This is a messy part. I’m
getting my- this is no longer the mouth. It’s just
some place to put the mess. I’m gonna cut the corner off and stick it in here. I
need someone to hold it for me oh and it’s gonna go from the stomach to the
small intestine. Who wants to try? Alright we have volunteer. Okay so what I need
you to do is just hold the mouth of that wide open over the bowl. I’m going to cut a little hole here. ok and it’s going to go from the stomach- hold it wide open. Oh my goodness you can see that the raisins did not digest as much as the other stuff did
right and that happens with some of the food you eat is a little bit harder to
digest. Like corn. Oh! I need you to hold it open Bud.
Remember it’s just bread, banana, water, and vinegar. and cookies. okay so your stomach is
squeezing it into your small intestine. there it is. It’s so pretty. thank you. do
you want paper towel? Go ahead. This is going to represent our blood stream okay.
yeah, yes, right, so the the small intestine is amazing. It is the longest
organ in your body. We’ll talk about that in a minute I’m going to show you
exactly how long it is. In fact maybe I’ll just tell you right now. How did you know that?
you did? okay well it’s either 22 or 23 because I’ve seen it written different
in different statistics. This string is 23 feet long.
I need Carter to grab one and of it. You’re gonna stand way over on that side.
Stand against the door as far as Far, far, far, away. okay. Leah,
grab the other end. You’re gonna go all the way out the door. Keep walking.
okay that’s how long your small intestine is. Can
you see how long it is? From one side of the room to the other. And it’s all coiled up
inside your guts. Now inside your intestine there’s all kinds of little
tiny hairs that increase the surface area of your small intestine. Thanks. so the surface area of your small
intestine is so large that it can cover as much space as a tennis court okay so
an organ this long, if you were to unfold every little piece and wave and
bump and hair it would cover full tennis court. Like the square area of a tennis
court that’s how much area is in your small intestine. Yeah I know that’s hard
to picture. And that is because that allows your body to distribute more
nutrients to your bloodstream. The more surface area it has okay so watch what
happens when I dip this into the blood stream. Take a look what’s happening.
What’s going into the blood? Yeah but not all of the food right? Nutrients that
were in the food are able to pass through the small intestine to the
bloodstream. Squeeze it! ok, We will! exactly, we will squeeze it cause what happens next? Once the blood stream has gotten all the
nutrients that it can from the small intestine then this lump will pass to
the large intestine. The large intestine- I’m just going to pretend that this is
the large intestine now. Ok cause I don’t have another stock and that one’s kind of yucky. So let’s pretend we’re in the large intestine now. What is the job of the
large intestine? Anybody know? The large intestine’s job is to recycle water to the body. okay this is where your body absorbs
water. My body needs this water to stay hydrated, right? ok, so this is what’s happening. All the water is being sucked out of the food you ate. all the nutrients out of this food that
I’ve used all the water that I can get out of this. I’ve got my nutrients. I’ve got my food.
my I don’t need this anymore. My body has used what it can. Right
it’s like slime now. It is it’s really it’s really gross. Okay so what happens
to this? What happens to this? What is this? What does it look like? This is poop. Once your body has used everything you can get out of
the food- I’m just gonna cut this so it’s easier. I won’t have to squeeze it all the way out. So when you need to go to the bathroom, this is what happens. your sphincter begins to squeeze. It’s more smooth muscle. Yay for digestion!! Yes it is. It’s cool but disgusting. okay
isn’t your body amazing? Your body can take – what did you start with? Bananas,
bread, cookies, water and your body used all of that and now your blood
stream is flowing all through your body right your whole body is benefiting from
all of those nutrients that it took in and it didn’t need this. So, bye bye. okay there you have it. That was the
nastiest class we’ve had at co-op yet. It’s also probably the most memorable
day we’ve had a co-op so far. So I hope you enjoyed that demonstration of the
digestive system. If you did go ahead and give it a thumbs up and stay tuned
because I’m gonna have more demonstrations like this, more activities
and projects that we’ve done that will hopefully be fun in your home school too,
and until I see you again in the next video just keep learning!