There is actually a little spot right there that they drain in to.

This is now going to dump into what we call a venule.

And let me actually show you where the blood vessels come from. These are called coronary vessels I just write the word coronary here.

And at the bottom here, you can't see it because it's on the other side of the heart, but there's another vein called the inferior vena cava.

I'll write that right here.

Into the IV, yes.

And it's actually coming into two veins, the one at the top, this is called the superior, superior just kind of means at the top.

There's also another one over here called the superior vena cava, and this is bringing back blood from the arms and head.

So you have these arteries right over here, the red tubes. Those are arteries. and then the blue ones are veins.

And it generally travels through two major kind of vessels.

I could just write artery and vein and essentially they would be behaving this way.

Artery up here, artery over here, and then vein in the other two spots.

And you might say, well that wasn't so difficult. I'll say bronchial vessels, because there are also some veins coming off.

A venule, and this venule is gonna basically then feed into many, many other venules.

I'm going to do some surgery here.

Inferior vena cava, and this is the large vein that brings back all the blood from the bottom half of the body.

So Superior Vena Cava and Inferior Vena Cava.

Start a largebore IV. Keep it open.

They would ordinarily support fish and other wildlife.

(APPLAUSE)

A little vein in his head popped, and that was that.

Well, these vessels, all of them, together are called coronary vessels.

So, here you have a giant vein, this is a vein, and you have an artery.

Maybe from the second toe, and it's gonna basically all kind of gather together, and again, to a giant, giant set of veins.

It's going to end up at the, maybe I should draw it here, it's ending up with the right atrium. That's just the name of the chamber where the blood ends up in.

And fortunately he didn't die.

I hope my veins don't pop.

She was being given medicine intravenously.

So you think of alternative mechanical parts.

Your life as you know it goes into suspended animation.

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

So these two veins, the superior vena cava and the inferior vena cava, are dragging the blood back to the heart, and, generally speaking, these are all considered, of course, veins.

What if you have an artery, like that, and you decide that you want to block it up on one end, maybe with your hand, like this, and let's say you do the exact same thing with a vein.

It handles LL. It handles LR. It handles LALR.

And you can see, it's lumpy bumpy.

And it sends off one vessel to the arm, one vessel up this way, the vessel over this way and then this arch gonna go down and splits like that.

You know, maybe veins are dumping in here now, maybe another vein dumping in here, and these veins are all going to dump into an enormous vein that we call the inferior vena cava.

Well! he exclaimed. Upon my word.

So if I was to make a volume pressure loop, with this, I could actually erase the word 'balloon' and 'bubble' and replace them completely with 'artery' and 'vein',

So now my artery looks a little fat, like a plump little sausage.

And then you've got the capillaries, you've got some blood kind of from both places the pulmonary circulation and the blood from the systemic circulation again mixing.

You cover up the vein, you do the same thing, you have one tiny opening here, and this opening, let's have it go down so it looks the same, and this opening is to a bicycle pump.

All was still.

And so when I draw these two, I really wnat you to just think of the two sides, veins coming from both sides.

So with the same amount of pressure you see a difference in the volume, and this is actually a critical point, because the artery and the vein really are behaving just like the balloon and the bubble, and it's actually very very similar.