On the inside you have what's called the endocardium. I'm gonna draw the endocardium all the way around here, it goes all the way around the valves.

There are actually separate names for the two layers.

It goes around the ventricle and, as I showed you in the beginning, also around the atrium. It goes all the way up and covers both the left and right side.

Now you can actually see the layers of the heart, the endocardium, myocardium and pericardium.

This is our myocardium.

There are 3 layers to the heart muscle. I'm gonna go through all three layers, we'll start on the inside and work our way out.

Within five weeks, you start to see the early atrium and the early ventricles.

When the red blood cells are entering the chambers of the heart, the part they're gonna see is the endocardium. This is what it looks like, this is that green layer all the way around that I've drawn now.

Then, look at that after three minutes.

So let's say that the solute is sugar.

So that's called the visceral pericardium.

Then he can examine how the heart is moving.

And then we put a lead, which is a wire, in the right ventricle inside the heart, which does the electrogram, which is the signal voltage from inside the heart.

This is all done in between the ribs.

I'm not doing a very good job making it look thin, but you can imagine what it is, what it could look like if I was to zoom in on it, basically something like that.

Endometritis is a disease where bacteria enter the uterus and cause inflammation of the inner membrane.

Then he can examine how the heart is moving.

So they break down

tearing their internal organs, their liver, their lungs, their heart bringing tissue, bone, blood, brain matter, and that's called a blowback.

We have a layer called the pericardium.

What's the matter with him?

Now that heart.

My heart!

My heart.

It is the argument of the heart.

Your partner, he's had a heart attack.

Looks like he died of natural causes. Maybe a heart attack.

It's her heart.

Feel my heart.

(HEART MONITOR BEEPING)

(HEART MONITOR FLATLINING)

Heart attack.

I thought my heart was gonna explode.

Therefore have organ meats like

He has internal damage.

But because these guys are on the right hand side of or in this case, on the inside of our membrane.

In that gap you might have a little bit of fluid, but it's not actually cells. I guess that's the biggest point, it's not cells, it's just a little bit of fluid.

Her heart certainly failed to beat.

Do you worry about what is going to kill you?

He might need surgery

My heart...

Bruises on his heart.

I think homeboy's having a cardiac emergency.

You have a strong heart.

I'm going to make a cut right there.