The left atrium and the left ventricle.

So what is that that is our left atrium.

Blood flows from the right atrium to the right ventricle, then it goes to the lungs and from the left atrium to the left ventricle.

The pulmonary veins drain blood and into the left atrium, right.

So just like before where we went from the right atrium to the right vertricle, now we're going from the left atrium to the left ventricle.

So just like our right atrium we have one on the left.

At the same moment blood is going from the right atrium to the right ventricle, blood is actually also going from the left atrium to the left ventricle.

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

So we've gone from the right ventricle around to the lungs, back again into the left atrium.

Let's start by labeling our heart, at the top, blood is coming into the right atrium, going to the right ventricle, it goes off to the lungs, comes back into the left atrium and then the left ventricle.

We can begin in the atrium.

This is chamber number two. It goes to the lungs and then back up to the left atrium.

Returning to the house, the girls cross the atrium.

The first into the right atrium. This is chamber number one.

And it's job is of course to make sure the blood does not go from the left ventricle back to the left atrium by accident. Wants to make sure there is forward flows.

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

And It's again stopped a little bit there, but I can fill it in and the pulmonary veins are gonna deliver that oxygenated blood to the left atrium.

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

Let's start with blood going from the right atrium, this way into the right ventricle.

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.

Left, left...

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

Here she is, drawing a picture of herself in the atrium of her father's enormous house.

That's to indicate deoxygenated blood and it goes back to the right atrium as deoxygenated blood.

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All the slaves are being gathered together in the atrium and await the arrival of their master.

So let's get started in the upper part of the heart. The Right atrium, It's right there.

And at the end, kind of somewhere up here, it's gonna go back to the right atrium.

And once the blood is in right atrium, it's going to head down into the right ventricle.

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