why do veins look blue
Channel: MidNight Questions
Date: 12/07/2022

What happens in our bodies to cause our veins to seem blue even though they are filled with red blood? Following is a transcript of the video.
 
If our blood is red, then why do our veins look blue?



Don't be deceived, your blood is always red.......whether it's flowing in your veins or spilling from a wound.

Skin scatters blue light more than red light.
An optical illusion enhances the effect even further.
The skin around the vein appears redder than the vein itself.
As a result, the color contrast highlights the veins' bluish tone.
Because of the iron in human blood, it is constantly red.
In your lungs, iron combines with oxygen, turning your blood red.
However, the blood of other animals differs.
Because not all blood is chemically same.
Copper is more abundant in crustacean and spider blood than iron.
When copper combines with oxygen, blood becomes blue.

Leech blood, on the other hand, includes iron......but it is less concentrated than human blood, therefore it appears green.

Blood, it turns out, is more colorful than you may imagine!

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