You're dead.

But for the sake of demonstration ... I think we should turn on the lights.

It's a few cell layers thick. On the inside you have some red blood cells bumping along.

And it doesn't have any mitochondria, no mitochondria.

I'm just gonna kind of try to target a couple of the tissues that I think people sometimes might have questions about.

And it's in every cell.

So that has no mitochondria, and it's not really using oxygen.

They found these red circular looking objects, and they looked, for all the world,

The yellow green area is the fluid of blood, which is mostly water, but it's also antibodies, sugars, hormones, that kind of thing.

And one of them, I woudn't really call it tissue, but you can definitely call it cell type. It's the RBC, and RBC just stands for red blood cell.

Baby's blood.

And to answer this question, I would have to remind you that the red blood cell basically looks a little bit like this, right, in cross section.

DONATE YOUR BLOOD TO THE RED CROSS

Its blood is red. It must have hemoglobin.

These are literally amazingly designed cells that are made for the purpose of carrying around oxygen to the body, because they literally are bags of hemoglobin.

was crimson with his blood

So people sometimes wonder, you know, if the red blood cells are carrying oxygen to other parts of the body.

Your blood count's dropping.

The streets will run red with blood... women's blood.

So it's not using oxygen and really these cells, we call them cells and there are many senses of the word, but they don't really have mitochondria, they also don't have nucleus.

If we were to shrink you down, smaller than the smallest thing you can see with the naked eye... you will find that your piece of hair starts to look... a lot more interesting.

The equator divides the globe into two hemispheres.

The equator divides the earth into two hemispheres.

What you're watching is a design of a robotic red blood cell, and it does bring up the issue that our biology is actually very sub optimal, even though it's remarkable in its intricacy.

The white blood cell count plummets.

Blood... so red...

It's not like donating to the red cross

If your iron count is low, will the doctor prescribe tonic... or air your report on TV

While we're waiting the analysis, let's get the blood count. So, place a small amount of blood on your slide.

To rule out fetal blood cells.

Grim was the relish you took as you licked the warm blood cool!

And those red molecules are hemoglobin.

Yeah, his blood wasn't even red.

Roughly, at the same time, Carnegie

They attack like white blood cells fighting an infection.

There's definitely an increased white blood count, with an absolute increase in lymphocytes having an atypical appearance.

The Red Cross supplied the hospital with blood.

And this outer layer, this is the vasculature, which is incredible, around a human brain.

We only suck nice crimson blood of it.

So, this is the Equator.

Now, let me draw a plaque there. and we've been studying plaque since the video on heart attacks.

Get me a CBC and tox screen.

End to end, that would form a line that would circle the earth twice.

Elevated whiteblood cell count, lowgrade fever.

Lab says some blood evidence found at my ci crime scene is almost human... except there's no red blood cells present.