Human blood can be blue. True or False?

False. Yes and no.

Human blood is always red, but depending on its oxygenation level, it is either bright red or dark red. Oxygenated blood is bright red, and blood low in oxygen is dark red.

The myth saying that de-oxygenated blood is blue comes from many different reasons and sources, such as the color of our veins. Our veins are blue because the tissue they are made up of is blue, but the blood inside is still a shade of red.

It is red because of of the iron in our blood. The iron is in the molecules of hemoglobin, which is in blood. When iron reacts with oxygen, it turns red. Mars is called the red planet because the soil has high amounts of iron, which led us to believe that oxygen, or some molecule containing oxygen such as water was once on Mars.

But the fun part to why I said yes and no. Some animals have copper instead of iron as a binding agent in their blood. Some snails and spiders to be specific. Copper turns to a greenish blue when exposed to oxygen, hence their blood being blue. Again, they have different shades of blue depending on the level of oxygen in their blood.

False human blood ain't blue it might look blue when it is coming out but other then that is red it will never be blue

Explanation:

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