the digestive system! - · pdf filediscuss let’s take a journey through the digestive...
TRANSCRIPT
DISCUSS…
We’re going to take a journey through the digestive
system. Before we go, who can tell me why we eat food in the first
place?
ScientificFunny and
fairly scientific
DISCUSS…
Energy! Well done, we get energy from food… but
this doesn’t mean that when we eat a sandwich it floats around
our body going into our legs and our muscles!
DISCUSS…
Let’s take a journey through the digestive system. Who can tell
me the first thing we do to our food to get the process going?
DISCUSS…
We buy it from the shops! Only joking… We CHEW it using
our teeth. This is called, MASTICATION. What is next?
SWALLOWING of course! The tongue actually pushes food
to the back of the throat and saliva helps it slide down through our
OESOPHAGUS. Next?
DISCUSS…
DISCUSS…
The food goes into our STOMACH.
Here stomach acids break down the food. Where does it go now?
DISCUSS… Our INTESTINES! First the
food goes into our SMALL INTESTINE which is actually not
very small as it is 22ft long. Then it goes through our LARGE INTESTINE.
As it goes through, the nutrients are taken from the food and
put into the bloodstream. Next?
DISCUSS…
We have now used all the energy from the food and can get rid of the WASTE, thus
making poo. Poo is stored in the RECTUM and then ejected
through the ANUS.
THIS IS CALLED EXCRETION
Experiment…
Right, it is time for you to make a model of the
digestive system. In your groups, discuss what you think each of these
could be used for. You will be using some things more than
once.
Experiment…
We then repeat that step again for the large
intestine. Step 5.
LARGE INTESTINE
LARGE
INTESTINE
Experiment…
Simple right?! Ok, now you’re going to do it for real. First things
first, make a sandwich!
Experiment…
Step 1.
One of you needs to chew (cut) the sandwich with the scissors
in the bowl. Give yourself a bit of a drink too.
TEETHMOUTH
Experiment…
Step 2.
Great job. Now pass the bowl to the next person. You are now going to swallow your food. If
it’s hard to swallow it all, have another drink!
Throat
Oesophagus
Stomach
Experiment…
Step 3.
Now, when your food goes into your stomach, the stomach acid breaks it down. You now need to
add some ‘acid’ and give it a swish around. Make sure the
bag is closed!
Stomach
Acid
Experiment…
Step 4.
Once your stomach has broken down the food, it is time to send the
nutrients around the body. We need to go to the small intestine. Pour the mixture through the tights/sock.
Make sure the bowl is underneath to catch the nutrients. Give the
tights a gentle squeeze.
Small
INTESTINE
Experiment…
Step 5.
Now, we go from the small intestine to the large intestine. To save getting
really messy we’re going to just imagine that we are now in the large intestine. You now need to squeeze
the last remaining nutrients out of your food.
Large INTESTINE
Experiment…Step 6.
Can you see all the nutrients in the bowl? This is exactly what your body does. As the
broken down food moves through your intestines, the nutrients are taken and sent off
around the body in the bloodstream. We are now left with the waste food. Who is going to do the
honours and create the anus? Cut a small hole in the tights and squeeze your
poo into the bowl.
ANUS
Experiment…
Well done. You made poo. Now think about your
lunch that you’ve just eaten. The same process is going on inside each of you right
now!