Why is blood red in color?

Coz everyday it baths 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.

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