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

So you think of alternative mechanical parts.

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

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

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

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.

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.

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

I'll write that right here.

Into the IV, yes.

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

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

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.

Cedars Sinai, where that night I receive, because of my internal bleeding, 45 units of blood which means full replacements of all the blood in me before they're able to staunch the flow.

And it came up in the right atrium from a giant vessel up top called the superior vena cava. And this is a vein of course because it's bringing blood towards the heart.

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

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

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.

You can see the atrium and the ventricles, how blood flows to our arteries and veins.

Other than low concentrations of sedatives and antidepressants, his blood was clean of drugs.

Endolymph fluid.

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

And it generally travels through two major kind of vessels.

I'm going to do some surgery here.

And anytime I mention the word vein, I just want to make sure you think of blood going towards the heart.

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

This is a brain from a lamprey eel.

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

This is an arterial, right.

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

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

let's say dumped into the air and the same on this side, and it's gonna come from their head and all three sources two arms and a head are gonna come together into one big vein

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

And these two veins, this is also a vein, these two veins are actually dragging blood in from all over the body, into the heart.

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.

Well, if Dr. Takada was a bit too fond of his Scotch, what I'm seeing here is oesophageal varices, and this tear caused blood to enter his oesophagus, causing him to vomit blood.

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

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.

She was being given medicine intravenously.

The other one had a lot of diarrhea.

So Superior Vena Cava and Inferior Vena Cava.