Question

Is human blood blue?

Answer 1

Blood is a continuously flowing fluid that provides nutrition, oxygen, and waste disposal to the body. Blood is mainly liquid, but it contains various cells and proteins that make it "thicker" than pure water. The average person's blood volume is around 5 litres .

Complete answer:
Human vein blood is not blue. The colour of blood is always red. Blood that has been oxygenated (mostly through the arteries) is bright red, while blood that has lost its oxygen (mostly through the veins) is dark red.

Because you're looking at your veins through layers of skin, the blood in them appears blue. Skin scatters a large portion of the red portion of white light before it can reflect off the blood, allowing only the blue light to reflect off the blood and back to our eyes. It's similar to how the white sun appears red at sunset because the blue colours are scattered by the atmosphere.

From the surface of your skin, the veins in your body can appear deep blue or even purple. But it has nothing to do with the colour of your blood. The blood is, indeed, crimson. The blue colour of the veins is due to how your eyes absorb and see colour rather than the colour of the blood.

The intensity of the red colour is determined by the amount of oxygen in your blood cells. Directly from the heart, blood is oxygen-rich and bright red. The blood darkens as it circulates through the body and oxygen is absorbed by tissue. As a result, blood returning to the heart and lungs also appears dark red. However, it is never blue.

Hemoglobin, a complex protein molecule found in red blood cells, is found in human blood. Iron is present in haemoglobin. The red colour of blood is caused by iron reacting with oxygen.

Arteries transport oxygen-rich blood away from the heart to organs and tissues in the body. Through the veins, deoxygenated blood is returned to the heart. There is less oxygen in the blood as it returns to the heart. It will remain red, but it will become darker. Because of the way light flows through the skin, this darker red appears blue.

No, human blood is not blue.

Note: The bluish colour of the veins is an optical illusion. Blue light does not penetrate tissue as deeply as red light. Due to the blood's partial absorption of red wavelengths, your eyes will see more blue than red reflected light if the blood vessel is sufficiently deep.Red blood is found in the majority of animals, including humans. However, there are a few exceptions. Some octopus, squid, and crustaceans have blue blood. Their blood copper levels are extremely high. As it reacts with oxygen, copper gives their blood its blue colour.