And then we put a lead, which is a wire, in the right ventricle inside the heart, which does the electrogram, which is the signal voltage from inside the heart.

So this is his right ventricle.

This is chamber number one.

The human heart is made up of four major chambers the right atrium, right ventricle, left atrium, and left ventricle.

So this is the right ventricle, down here.

So blood goes into the rigt verticle and where it goes next.

The mitral valve is positioned in the heart's left side between the left atrium and the left ventricle, and the aortic valve separates the left ventricle from the aorta.

The Right atrium, It's right there. And the blood goes down into the right ventricle.

And then, on the other side I'm going to label the last two chambers. The left atrium and the left ventricle.

You're saying, hey, why is it the right ventricle?

It pumps again and then it pushes it through here.

You have simultaneously two chambers that are full of blood, the right and left ventricle.

And it passively, once the right ventricle pumps and then releases, it has a vacuum and it pulls more blood from the right atrium.

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.

The pulmonic valve separates the right ventricle from the pulmonary artery.

From the right atrium, it gets pumped into the right ventricle.

Then it shows up in the right ventricle, right?

Let's start by labeling our heart, at the top, blood is coming into the right atrium, going to the right ventricle, it goes off to the lungs, comes back into the left atrium and then the left ventricle.

Let's start with blood going from the right atrium, this way into the right ventricle. At the same moment blood is going from the right atrium to the right ventricle, blood is actually also going from the left atrium to the left ventricle.

So just like before where we went from the right atrium to the right vertricle, now we're going from the left atrium to the left ventricle.

Well, blood leaves the right ventricle, goes through a valve and after, on the other side you've got, this area right here.

It actually passively flows into the right ventricle.

So this is chamber number three.

And the first one, the pulmonary circulation, is really kind of relying on the right vetricle as the pump. And the second one is relying on the left ventricle as the pump.

In the new cycle you have a bit of blood that's going from the right atrium to the right ventricle.

The answer is no, because what happens is that as blood is moving down from the atrium to the right ventricle,

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

And the Arotic valve is going to be what divides the left ventricle from this giant vessel that we talked about earlier.

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.

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

left ventricle and then the left ventricle pumps that oxygenated blood to the rest of the body via the non pulmonary arteries.

Now in the left ventricle, after it's done pumping, it expands and that oxygenated blood flows into the left ventricle.

Let's say that by accident our ventricle was just too strong, too powerful, let's say it broke one of these cords.

Turnhout.

A heart?

Heart

Hypoplasia of the heart is generally a cyanotic heart defect.

Then the left ventricle the ventricles are what do all the pumping it squeezes and then it pumps the blood into the aorta.

PETER Musicians, O, musicians, 'Heart's ease,' 'Heart's ease'

Melts fans hearts?

Young hearts.

No heart? No heart?

No heart.

Lonely hearts

Steel my soldiers' hearts