And the veins actually drain into a spot , directly into the right atrium.

This is an arterial, right.

Acid for blood.

What blood?

And I've drawn it as one tube with no split and this is the pulmonary trunk. Pulmonary trunk.

This is highly thrombogenic material. Thrombogenic, very fancy word.

Royal blood.

The cycle of blood is not regular.

No, it's dark in here.

47,905 blood samples.

My blood test.

Well, we'd have to transfuse Charlie with the creature's blood.

It's gonna be going initially through a giant vessel.

And this is of course the aorta. This is my aorta.

Something in the blood.

Like can you analyze blood?

You were running the tests on yourself.

And then on the other side where the veins are bringing blood back to the heart most of the blood as it turns out, most of the blood actually goes this way into the pulmonary veins.

Moderate exercise invigorates the blood circulation.

What's happening between these two, time like here, is that blood is actually squeezing out because the pulmonic and aortic valves just opened, blood is squeezing out and going to the whole body.

What is your blood type?

What's your blood type?

There's Tru Blood.

Blood flows through blood vessels.

It pumps the blood and in particular it takes in the blood from the rest of the body.

And has concentrated acid for blood.

In her blood.

And these are called the bronchial arteries.

Moderate exercise stimulates the circulation of blood.

Narrator As the hunters display their kills, something surprising happens.

But, actually lungs are kind of interesting in the sense that there is a lot of mixing going on.

So let's get a little more precise with the words we've been talking about, especially with heart disease and heart failure and all of the rest.

Oh, and blood.

Where's that blood?

Blood type, b negative.

From your blood.

We got blood?

Oh, you're referring to the blood tests

That's charming, walter. Blood samples are ready.

A tight belt will interfere with circulation of the blood.

And that's gonna be dumping into the top of the heart. And then separately you have veins from the legs.

If you had an acute congestive heart failure, they could bleed a pint of blood from you by opening up an arm vein, giving you a crude leaf preparation of digitalis and then giving you oxygen by tent.

This is an artery. And blood is actually going through the artery, that way.

They took a sample of my blood at the hospital.

So these are the two direction the blood is going to be flowing.