LET'S MAKE A MODEL OF A LUNG! We did this at Science Crazy last week and it was a huge hits with the parents and the kids! It is such a simple but effective way of demonstrating how a lung works!
As you make your model I will talk you through the different parts of the lung.
As you make your model I will talk you through the different parts of the lung.
For this
project you will need:
- Some plastic tubing – alternatively you can use straws
- A clear empty 500ml bottle (make sure the bottle is a sturdy plastic)
- 3 balloons
- Modelling clay
- Electrical tape (I found this worked best)
- A craft knife or Stanley knife
- Scissors
STEP ONE
First we
need to cut the end off our water bottle.
TIP: I like using a water bottle with quite a thick
plastic as otherwise the balloon can crush it out of shape.
Cut some
plastic piping, you will need two pieces about 8cm long each.
These
tubes represent the trachea (often known as your wind pipe).
In the
body the trachea is one tube that splits into two, feeding air, from your mouth
and nose, into the left and the right lungs.
These
tubes, the trachea, when it reaches the lungs, split into bronchi
Brochi is the plural of bronchus.
The
bronchi then branch out into bronchioles, these branches then end at tiny sacs
called alveoli, which is where the gas exchange takes place; this is where the
oxygen (O2) is drawn into the blood and the carbon dioxide
(CO2)
is taken away.
STEP THREE
Put a balloon
on the end of each piece of cut tubing with about 3-4cm of the tube tucked
inside your balloon. Seal the end of the
balloon and attach it firmly to the tubing using some tape.
These are
your lungs where all the bronchi, bronchioles and alveoli is contained.
STEP FOUR
Put your lungs
with the attached trachea (the balloons fixed to the tubes) into your bottle, and hold in place with your modelling clay
like this…
Now you
will need your third balloon. What you
want to do is tie a knot in your balloon, w ithout inflating it. Now cut the top of the balloon off (I tried
the base of the balloon in my very first attempt but it was much trickier and
this way leaves you with a handle. You
will see what I mean when we have finished making our model of a lung.
STEP SIX
Stretch
the balloon from STEP SIX over the bottom of your bottle where you made the cut
and stick it down with some tape. This
is to represent your diaphragm.
The diaphragm, in the body, is a major muscle of
respiration, it’s located below the lungs and is a large dome shaped muscle
that contracts rhythmically (like your breathing pattern) and constantly (else
if it stopped we would stop breathing and die!). Most of the time it works involuntarily.
The reason we needed a bottle with quite thick
plastic is because the balloon used in this step that represents our diaphragm
needs to have not gaps round the edge and it’s important it doesn’t rip. If
there are any hole or gaps, our lung model will not work.
IMPORTANT
MAKE SURE THERE ARE NO GAPS BETWEEN THE TUBES AND THE EDGE OF THE NECK OF
THE BOTTLE, THIS IS IMPORTANT SO YOUR MODEL WILL WORK.
Your model is complete. Now here’s how it works…
Pull the
balloon at the bottom of the bottle, the balloon that represents the diaphragm. When you do this you should, if you have ensured
there are no gaps around the tubing or the diaphragm, see that the lungs, represented
by the two balloons attached to the tubing, inflate.
Push the balloon up into the bottle, the lungs, the balloons in our case, will deflate. This is beause there is less room in the bottle because the diaphragm gets in the way, it's pushed the air out through the tubes like our diaphragm pushes air out of our lungs and back out through our air ways ( our nose and mouth).
This works
for in the same way as our lungs in the body.
When we pull the diaphragm in our model, we are simulating what happens
when the diaphragm in our body contracts.
When it does this, it makes room for more air that enters our lungs
through our mouth and nose and down through the trachea, which is the tubing in
our model.
A fun fact!
The lungs are known as the lights, this is because they are the lightest muscle in your body and it's where the term 'I'll knock your lights out' comes from! How cool is that. I got that fun fact from my local artisan butcher from Rose House, Ipswich. Check him out here , his meat is amazing and he's so knowledgeable! (I am not being paid to say this)
To learn more about respiration, try this experiment...
Diffusion...
A fun fact!
The lungs are known as the lights, this is because they are the lightest muscle in your body and it's where the term 'I'll knock your lights out' comes from! How cool is that. I got that fun fact from my local artisan butcher from Rose House, Ipswich. Check him out here , his meat is amazing and he's so knowledgeable! (I am not being paid to say this)
To learn more about respiration, try this experiment...
Diffusion...
I guess you have to make them positive about all the things that are very interesting for them.
ReplyDeleteCool representation of human lungs. It would be cool if you could make a full human body representation. I mean, in the same term of simplicity as this bottle lungs are. At least it could be a great way to show how biology works even in schools with pretty bad funding. You know what I’m talking about, schools that are not the place for Apple Vs Samsung wars. Because they can’t afford themselves so expensive things like that.
ReplyDelete