And then you can see the inside of the heart.

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.

Is it here, only here, and what?

The first into the right atrium. This is chamber number one.

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

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

So the blood from the arterial side is coming from the aorta and on the venous side it's actually not even dumping into the inferior or superior vena cava, kind of little known fact that is coming directly into the right atrium.

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

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

So unlike the CAT scans, X rays, thalliums, for women whose breast is in the way of looking at the heart, every time we order something that has even a small amount of radiation, we say, Do we really need that test?

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.

So you've already learned that the valves got endocardium.

Pookums here really has her heart set on another R2.

So I'm gonna just take some blue paint to indicate deoxygenated blood or blood without oxygen, I'm gonna paint in how it look.

The pulmonary veins drain blood and into the left atrium, right.

So what is that that is our left atrium.

This is chamber number two. It goes to the lungs and then back up to the left atrium.

Let's start with blood going from the right atrium, this way into the right ventricle.

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

Pookums?

Buildings are becoming bundles of services.

So we've gone from the right ventricle around to the lungs, back again into the left atrium.

And then it's gonna come out on the other side, in the pulmonary veins.

This is the second chamber of the heart. And it gets there by passing through the valve.

The wife!

Solitary.

That's my wife.

My wife...

So the first branches go and serve the heart. So it's kind of the first to get systemic circulation blood.

Grisha, someone's knocking on the door.

My wife.

Which one?

Who lives here?

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.

So you're probably feeling pretty comfortable with the diagram of the heart, but let me just go ahead and label a few things, just to make sure we're all on the same page.

Between dub and the next lub, so in this area, at that point, blood is refilling from the atria to the ventricles and we call that diastole.

This would basically start flipping back and forth, it would flip this way and this way.

Carbon dioxide is exhaled... and oxygenated blood continues passing through the veins... into the left auricle... through the left ventricle, passing out again.

...that your wife is calling the morgues.

Exwife.

Meet my wife.

Yeah yeah yeah, got a hot wife... hot hottie.

It's mine!

It's mine.