Question

Why
does
blood
appear
red
in
colour?​

Answer 1

Answer:

because of the RBC's present in the blood .

Answer 2

Explanation:

"""""Human blood is red because hemoglobin, which is carried in the blood and functions to transport oxygen, is iron-rich and red in color. ... But our blood is red. It's bright red when the arteries carry it in its oxygen-rich state throughout the body.""""""

Blood is red to the naked eye. Under a microscope, it depends.

This isn't because it isn't really red, but rather because its redness is a macroscopic feature. Human blood is red because hemoglobin, which is carried in the blood and functions to transport oxygen, is iron-rich and red in color.

Octopuses and horseshoe crabs have blue blood. This is because the protein transporting oxygen in their blood, hemocyanin, is actually blue.

The blood of a vulcan is green, according to the story anyway, and this is presumably because the stuff that carries oxygen in the vulcan's blood is green.

But our blood is red. It's bright red when the arteries carry it in its oxygen-rich state throughout the body. And it's still red, but darker now, when it rushes home to the heart through the veins.

I bring this up because I've noticed that there are a fair number of people — some of the 7th graders my son goes to school with, some teachers, too, who ought to know better, as well as lots of people who have published online — who say that blood inside the body is sometimes blue.