What is blood pressure?

It's a form of acupressure.

No.

In order to deliver oxygen and nutrients.

To each and every cell of our body.

Our heart pushes blood through tubes called blood vessels.

As the blood moves, it exerts force on the vessels' walls.

The measurement of this force of blood on the walls is called blood pressure.

The ideal blood pressure reading is.

About 120 over 80 millimeters of mercury or slightly below it.

But why does the reading have 2 numbers?

It is because our heart is constantly contracting and relaxing.

During a phase called systole.

Our heart contracts to push the blood through arteries.

Thus increasing the pressure.

So, the bigger number indicates the systolic blood pressure.

Whereas during diastole, our heart relaxes, decreasing the pressure.

So, the smaller number indicates the diastolic blood pressure.

How does blood clot?

With the help of glue.

Not at all.

Our blood consists of red blood cells, white blood cells.

Platelets, clotting factors, etc. suspended in a liquid plasma.

Hey.

I too have a plasma, look.

Oh.

Please listen.

Usually, when a blood vessel gets ruptured and we bleed.

Our blood begins to form a clot.

First, the platelets start sticking to the broken vessel and each other.

Thus forming a loose plug.

But this plug is not enough to stop bleeding.

Hence, the clotting factors take part.

In a complex chain of chemical reactions and create fibrin strands.

These strands criss-cross one another and create a mesh.

That tightly holds the loose plug together and makes it strong.

Red blood cells and white blood cells also get trapped in the mesh.

Thus creating a blood clot that completely stops bleeding.

Why is blood red in color?

Because everyday it bathes using red paint.

No.

Our blood mainly consists of.

A liquid called plasma, red blood cells, white blood cells and platelets.

However, the color of our blood is basically because of red blood cells.

Each of the red blood cells contains hemoglobin.

Hemoglobin is an iron rich protein.

When hemoglobin binds with oxygen.

The interaction between them gives our blood its red color.

Moreover, like human beings, not all animals have red color blood.

This is because the blood of some animals.

Such as octopuses, spiders, etc. has hemocyanin instead of hemoglobin.

Hemocyanin is a copper containing protein.

When hemocyanin binds with oxygen, their interaction gives the blood a blue color.

The blood of some lizards has biliverdin instead of hemoglobin.

Which give their blood a green color.

Blood Rain.

Relax.

Blood rain has red colored water droplets.

There are various reasons behind this.

Around Sahara Desert.

Brownish dust and sand carried by storms mix with water droplets in clouds.

Giving rain its brownish red color.

In Kerala, red spores of algae called Trentepohlia Annulata.

Got carried by wind and mixed with water droplets, causing blood rain.

While, in Zamora, Haematococcus Pluvialis algae got caught in rainclouds.

Got stressed and produced a red pigment called astaxanthin.

Causing blood rain.