And we said in the last video that you have these capillaries, these pulmonary capillaries that are running all along the side of these alveoli.

I'm still waiting for the Bloody Marys. Coming right up.

And, of course, the actual capillaries have cells that

It needs to be constantly contracting, so therefore it's almost selfish. It's grabbing its blood vessels for itself.

I'm not the Bloody Carmila they like to portray me as.

Soon we'll be able to see it the home of Carmila, the Bloody Countess.

So the blood's going to come in an arterial that's an arterial capillary, you could say.

And the first thing that makes me think is that blood vessels are like highways for the tumor cells.

This is what's been written in report no.

Some of my hypotheses are that when you first think about skeletal muscle, there's a lot of blood vessels going to skeletal muscle.

Well, actually, this whole thing is called the Bowman's capsule.

Is it possible that muscle somehow intuitively knows that it needs this blood supply? It needs to be constantly contracting, so therefore it's almost selfish. It's grabbing its blood vessels for itself.

Normally, when we leave a capillary system like the glomerulus right there, we're normally dealing with the venous system, but here we're still an arterial system.

And then they pick up the oxygen from inside the alveoli or the oxygen diffuses across the membrane of the alveoli, into these capillaries, into these super small tubes.

So this suggests that maybe if there is an anti angiogenic factor in skeletal muscle or perhaps even more, an angiogenic routing factor, so it can actually direct where the blood vessels grow this could be a potential future therapy for cancer.

So first of all I thought, you know, Wouldn't it be favorable to cancer getting to skeletal muscle? And as well, cancer tumors require a process called angiogenesis, which is really, the tumor recruits the blood vessels to itself to supply itself with nutrients so it can grow.

So this suggests that maybe if there is an anti angiogenic factor in skeletal muscle or perhaps even more, an angiogenic routing factor, so it can actually direct where the blood vessels grow this could be a potential future therapy for cancer.

16 percent! Meaning that there were these pinpoint tumors in skeletal muscle, but only .16 percent of actual metastases suggesting that maybe skeletal muscle is able to control the angiogenesis, is able to control the tumors recruiting these blood vessels.

Now, a word that you might hear in a medical context is stenosis , and the word just refers to the narrowing, usually of a blood vessel.