Yeah.

Mhm.

We are stardust in seawater.

The iron in our blood comes from the death of supernovas like all iron on our planet.

And it contains salt and water.

Like the oceans.

We came from.

The circulatory system of veins, arteries and capillaries is about 100,000 km long, twice the circumference of the earth.

Most of that is the capillaries, tiny blood vessels and holloway's that reach nearly every cell in the body.

You may know that your blood is A.

B.

O.

Or a B.

But there are other types you may not have heard of, including Duffy Kid.

Okay.

And the epically named Lance Taina Vienna animals have blood types.

Two dogs have eight cats have three.

When humans first tried to transfer blood between bodies, they used the blood of a lamb and a calf.

Now we stick to carefully chosen human blood.

Blood transfusion is so common every three seconds worldwide, someone receives a stranger's blood.

We don't have the same supply sloshing around our veins.

All our lives.

Our blood is in a constant state of decay and renewal.

Red blood cells live in our body for about 143 days decanted into a blood bag.

They have a shelf life of between 35 and 49 days.

Blood last longer than milk, but not as long as cheese in arresting human.

The heart pumps a liter of blood every 10 seconds and it beats on average 75 times a minute.

A blue whale's heart the size of a small car beats five times a minute and less on deep dives, shrews 1000 times a minute.

The average human contains 8-12 pints of blood but can usually survive losing up to 40%.

After that point, the organs begin to shut down because they are not being fed oxygen by blood.

Blood has always been thought powerful.

The mythical figure of Medusa symbolized human fear and awe of blood.

Blood from the right side of her body was fatal.

While that from the left side could restore life.

We may not believe in greek myths anymore, but the force of blood remains in language.

Blood brothers, Blood feud bloodlines.

Blood is essential for human life, but there is still plenty.

We don't know about this exceptional substance.

Scientists can now grow red blood cells in the lab, but they are extremely expensive for now.

The only way to get this life saving, life enhancing liquid is out of the goodness of someone's heart and the veins in their arm.

Thanks for watching.

If you enjoyed that, be sure to check out these videos next, and if you haven't already hit the subscribe button and click the bell to get a notification.