Flap, you fool!

So this valve is called the Tricuspid valve.

Flap your wings Now

And it passed through the valve here. So this valve is called the Mitral valve.

Civil Horizontal Valve

Can you flap your wings?

One will be the tricuspid valve and the other the mitral valve.

What paper went into that flap?

But before it goes it has to passed another valve. So this is a valve right here. Call it Pulmonary valve.

How would you make a single flap?

The main valve is turned off.

Here you've got the aortic valve.

I didn't have to try to flap my wings.

We're going to learn how to make one flap.

Well, there are other ways of making a flap.

If I make the flap as skinny as possible,

This is called a cycle valve tube.

Up here you have the pulmonary valve.

And then the final valve, I need to find a nice spot to write it maybe to right here, this final valve that passes through is called the Aortic valve.

You can see how the pulmonary and aortic valve are closed when the mitral and tricuspid valve are open.

Quick to assemble. It's got a flap that's the invention.

Can I borrow a heart valve from you?

And this is how you make a valve.

It's gonna go back perhaps through the mitral valve, it can go there, or it might go through the tricuspid valve.

This is actually a heart valve, which we engineered.

I welded the breech, but the valve is still gaping.

Does the color of the valve matter? What matters here?

It's very complicated, but it turns out they flap their wings very quickly.

So that's the flap, and all the rest of the paper's left over.

Let's watch. (Sound of air escaping from valve) (Music) (Whirring sound)

And if I make the flap from the middle, it uses a full circle.

Open the air inlet valve to supply compressed air to the machine

And the way you engineer this heart valve is the same strategy.

If I put the flap on the edge, it uses a half circle of paper.

I'm curious, you started your beautiful sequence on flight with a plane kind of trying to flap its wings and failing horribly, and there haven't been that many planes built since that flap wings.

I'm curious, you started your beautiful sequence on flight with a plane kind of trying to flap its wings and failing horribly, and there haven't been that many planes built since that flap wings.

You can see two of the leaflets of the aortic valve working there.

And you can see there, it needs a quarter circle of paper to make a flap.

Here you have our tricuspid valve. And I'm gonna label it just as 'T'

I've drawn the pulmonary valve as being open, but is that really the case?

On the starboard side, there's a big valve! Can you crank that boat down?

This is actually a heart valve that we've engineered, and you can see here, we have the structure of the heart valve and we've seeded that with cells, and then we exercise it.

It has a funny tri lobal shape at the bottom, which contains the aortic valve.

So, no matter how I make a flap, it needs some part of a circular region of paper.

The un digestive food reaches the Ileo cecal valve and enters the large intestine or colon.