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Blood is never blue. It does not give up its hemoglobin, it gives up (part of) its oxygen. If you get blood taken, it's from a vein, and it's not blue. It never meets oxygen during the transfer. Deoxygenated blood is most certainly NOT blue, but a darker red. Veins are made blue by distortion of light by your skin which prefers to take in the red light spectrum and turn away blue. The vein itself is actually white or cream in colour. Many people think blood is blue because of textbooks making diagrams blue, so as to not confuse readers on where the veins are located.
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To expand on the above answer... Oxygenated blood is a bright red and deoxygenated blood is a darker red. This is because of the molecular shape/electron configuration of oxyhaemoglobin making it absorb a specific part of the visible spectrum. Deoxyhaemoglobin differs slightly in its shape due to the lack of oxygen.
Specifically, hemoglobin contains a heme group. This heme group consists of a single iron atom surrounded by a porphyrin ring. The ring absorbs color from the visible spectrum because of its high number of conjugated double bonds. The iron atom serves as a chromophore; when bonded with oxygen it changes the wavelength of absorption---giving the blood its lighter red color. Without oxygen, the color changes.
I've heard there may be a slight blueish tinge to deoxygenated blood but if you see it, it is decidedly dark red.
Veins appear blue when looking through the skin because the tissues of the bodily more readily absorb red. Blue is unable to pass through the opaque walls of veins and is reflected back to the eyes. Also, because of the way the brain processes color the difference between pinkish skin and the blue tinge is exaggerated. However the capillaries will appear red because they are not 0.5mm below the skin, so the subcutaneous tissue has not absorbed as much light as it would for a deeper vessel.
I may be slightly off on a couple particulars but that's the gist of it.
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What colour is a red blood cell when it is deoxygenated?
The color of a red blood cell is dark red when it is deoxygenated.
What is unoxegenated blood's color?
Deoxygenated blood is typically a dark red or maroon color.
What color does blood turn when it is oxygenated?
Oxygenated blood is bright red; deoxygenated blood is dark red.
What is the color of the blood coming to the heart and blood coming from the heart?
All blood is red, regardless of where it is in the body. Oxygenated blood and deoxygenated blood have slightly different shades, with deoxygenated blood being darker and oxygenated blood brighter.
What colour is blood when it does not contain oxygen?
Deoxygenated blood is a darker red color compared to oxygenated blood. This is because of the lower levels of oxygen and higher levels of carbon dioxide present in deoxygenated blood.
What is the color of the human beings blood?
Deoxygenated Blood is Blue but when it oxygenates with the oxygen in the air it becomes Red
What color is a sheep's blood?
oxygenated blood is a bright red (in arteries), deoxygenated blood is a dull brick red (in veins).
Blood is scarlet red in color when it is loaded with what?
Blood is scarlet red in color when it is loaded with oxygen. Oxygenated blood appears bright red, while deoxygenated blood appears darker.
What is the definition of deoxygenated blood?
Deoxygenated blood is blood that has low levels of oxygen and high levels of carbon dioxide. It is typically darker in color compared to oxygenated blood. Deoxygenated blood circulates through the body to deliver carbon dioxide to the lungs for removal.
What is the difference between a vain and a oltery?
arteries carry oxygenated blood, veins carry deoxygenated blood. that's why arterial blood is lighter in color than blood from veins.
Why is the pulmonary trunk and pulmonary arteries colored blue?
The color blue is to symbolize that DEoxygenated blood runs through them.
Why do we represent blood using the colors red and blue?
Blood is actually the color red, so blood is represented by the color red because it is red. It is sometimes represented by blue to represent deoxygenated blood, which is actually dark red as opposed to the bright red of oxgyenated blood. This is purely for visual purposes so those learning about the circulatory system can see clearly where there is oxygenated blood and where there is deoxygenated blood. The myth that human blood is blue is not true, but the blood of a horseshoe crab is actually the color blue.
