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

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

I'll write that right here.

Into the IV, yes.

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

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

But this is not as I said in the beginning bad way of thinking about it.

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

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

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

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.

Start a largebore IV. Keep it open.

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

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

I can't really show blue on blue, but you know, just try to see they kind of go there.

And it generally travels through two major kind of vessels.

I'm going to do some surgery here.

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

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

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

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

They would ordinarily support fish and other wildlife.

And fortunately he didn't die.

So you think of alternative mechanical parts.

She was being given medicine intravenously.

So Superior Vena Cava and Inferior Vena Cava.

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

I need two largebore Ivs, 6 units Oneg, type and cross for 6 more units,

Or from the point of view of the person whose heart it is, it's on the left.

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.

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

I hope my veins don't pop.

And remember I call them arteries, because they're going away from the heart. And there are two arteries, so pulmonary arteries left and right pulmonary arteries.

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

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.

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.

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.

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

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

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.

Get out of my way.

No. No.

So the thread of discovery that we have really is a thread.

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.

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',