Your rhythm becomes irregular, and that's what happened 45 minutes later.

The bottom, the red part, is the muscular part. This is the strong muscular part.

And these micro machines power how a cell moves.

And then you can see the inside of the heart.

And then it goes into the right ventricle.

But I thought you were going to be there.

It has everything an ambulance has except for a bed.

I got a fibrillation.

Get the paddles.

On the other side you have the mitral valve, which separates the left atrium from the left ventricle.

And once the blood is in right atrium, it's going to head down into the right ventricle.

Two of the valves I'm gonna name, I'm giving them new names, something slightly different from what we've been referring to them by. These are the atrioventricular valves.

So this is chamber number three. And then the left ventricle.

little, itty bitty creatures called cells.

I've got the paddles.

So blood would flow from the left ventricle, into a place it shouldn't be going, the right ventricle.

BP 80 over 30. He's in Vtach!

Keep your eye on the valves and we'll talk about them as the blood moves through.

We're awfully careful in the lab to try and avoid various biohazards.

We're gonna start our journey here at the right ventricle. So what's the first thing that kind of comes across?

Let's open that IV, please.

And the blood goes down into the right ventricle. And then, on the other side I'm going to label the last two chambers.

I'm going to show you just how early this technology is.

The observation that stem cells, as master cells, could give rise to a whole variety of different cell types heart cells, liver cells, pancreatic islet cells captured the attention of the media and the imagination of the public.

That's their job.

Come in, control, there is our target moving to 66.

Let's say this toe right here.

Oh,it's a defibrillator.

From the body... to the right auricle... to the right ventricle... and out the pulmonary arteries to the lungs.

From there, we're actually going to get into what we call arterioles.

On the left, we see a tiny piece of beating heart tissue that I engineered from rat cells in the lab.

You probably know, if you've been paying attention to some of the science literature that you can now take a skin cell and encourage it to become a liver cell or a heart cell or a kidney cell or a brain cell for any of us.

When you are away, I feel lost.

The centrosomes have gone to opposite sides of the cell itself.

So let's get started in the upper part of the heart. The Right atrium, It's right there.

But now remember that blood is constantly moving through the heart, so in a previous cycle you actually had some blood that's coming back from the lungs and that's what's dumping into the left ventricle.

Each one plays a particular role a heart cell, a muscle cell, a brain cell.

unfortunately, i don't have a defibrillator!

We're gonna actually follow the path of blood after it leaves the right ventricle.

Blood flows from the right atrium to the right ventricle, then it goes to the lungs and from the left atrium to the left ventricle.

And it goes down into, you can probably guess how this one is called, is our left ventricle.

Use extreme caution.

Then, they sprayed stem cells onto that heart, from a mouse.

So how do we do that?

And it's walked away I mean, it's that mechanical.