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What color is blood?

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Question: Do we have red or blue blood?

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This is a great question that needs an elaborate answer. Let's explore together what is blood as well as its function. Blood is the major component of the body's circulatory system. It is constantly pumped through our bodies and organs to distribute oxygen and nutrients to all cells in the body. Oxygen is needed to produce energy that fuels most the body's metabolic processes. Upon oxygen release, the blood picks-up carbon dioxide generated by the cells as a waste product and brings it to the lungs for exhalation. It is extremely important to get rid of carbon dioxide as it increases blood acidity. In order to meet the increased demand of the body for oxygen, blood cells are equipped with a metalloprotein (a protein with a metal core) known as hemoglobin. The metal core in hemoglobin, which is iron, binds to oxygen and helps with its transport across the body.

To get back to your question, human blood is always red and never blue. However, the color of the blood ranges from bright red, when it is oxygenated, to dark red when it is not. When blood leaves the heart to be transported to organs and tissues, it carries oxygen in its hemoglobin. When oxygen is bound to iron, the blood looks bright red. Once oxygen is released, and carbon dioxide binds, the deoxygenated blood looks darker in color.

The mistaken belief that deoxygenated blood is blue is due to the fact that darker blood absorbs less light. Light is an electromagnetic radiation of different wavelengths. Visible light consists of different colors (the colors of the rainbow) when combined, they look white. According to some researchers, tissue optics (how light is absorbed and scattered) is responsible for the blue blood phenomenon. According to this theory, the depths of the veins as well as the darkness of the deoxygenated blood reflect the blue color of the light spectrum. Since the blue color is not absorbed, it is "bounced back" and the eye sees the veins as blue.

http://www.binghamton.edu/news/the-newsroom/ask-a-scientist/index.html?date=2011-03-07

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Red

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Have you seriously never seen it?

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Maybe she's colour blind.
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Yeah
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Blue when it doesn't have oxygen in it. Red when it does.

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No, it is always red.
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No, no it's not. Look at your wrists.
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then explain why our arteries are red when they go to the lungs
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Arteries carry oxygenated blood.
Veins carry oxygenated (blue) blood.
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*Veins carry unoxygenated (blue) blood
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It looks blue because of the darkness of the blood and the way light reflects off of it. The blood itself is not blue.
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I asked about when they go to the LUNGS, before they get the 02. The blood is still red!
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blue as blue gets its blue when there is very little oxygen . blue as the ocean
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Its never blue, the veins are blue because they have pigment and then skin over it with more pigment and it ends up looking like blue through our skin but blood is never blue
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imthedoctor, thank you for knowing something!
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Interesting facts.
I just thought of something.. People turn blue when lack of oxygen..I don't know how to apply that tho lol .Have a good week all/.
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BrotherObscura
blue when not carrying oxeygen red when does basic bio people
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It's bright red.

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Red, maroon, scarlet. Blue when there is no oxygen in it

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Blood is never blue
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Unoxygenated blood is blue but once the body has oxygenated it or it has come into contact with oxygen it turns red

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No, it's not.
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yea, it is.
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Yes it is. I have taken Biomedical sciences And human body systems in school. College level thankyou
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blood is not blue when it is inside of you, it is still red. don't listen to these lies
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Blood is blue when it doesnt have oxygen! Everyone is stupid apparently. Im going into the medical field!
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i'm just listening to my science teachers and such but i;m sorry. i forgot you are a doctor and you have studied our blood for 10 years. my bad bro
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Ever heard of blue blood cells? If you have, tell me.
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yea actually. its in my science book but what ever. you know all, you see all. im done
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You are all crazy. You guys havent apparently been listening closely to your teachers
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exactly, i actually listen in my classes and this is what im told. and the science book i have has a pic of t blue blood cells. they look kinda purple but still have the pic.
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Thankyou!
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At least someone know some common sense!
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Dude it's not blue. You should probably study harder. And learn to spell 'apocalypse' while you're at it.
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Really? Well if you look above it it also says krav maga which is the israeli military self defense system which means does it look like i care??
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when did anybody mention apocalypse anywhere?? and like i said. i have a science book right here that has blue blood cells. so apparently their are some blood cells somewhere out their. and by the way, since its kinda hard to study something without exposing it to oxygen at one point in time which is why their arent many pics of blue blood cells.
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Wikipedia Blood, go to 4. Color, the section HEMOGLOBIN. You will see I am right
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you do realize random people can edit wikipedia. i wouldnt trust wikipedia with my life.
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Im done! You all are stupid! Im taking medical classrs and PPR has a book in front of him! Are you all really that dumb!
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Yes, thank you, I am well versed in that particular martial art. I don't see what it has to do with a medical degree or being able to write with any degree of proficiency, but I know what it is.
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ppr: nobody can go put up crap on wikipedia without experts deleting the false info within seconds. It's reliable
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It means i dont care how to spell apocalypse. We are human we make spelling mistakes! You are all just stupid and dont know anything about the human body apparently!
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just because they are called "experts" doesn't mean they know everything. i dont care. you can try and persuade me all you want, i don't nor will i ever trust wikipedia. and who said anything about martial arts?
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I know enough to know that blood is red.
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It is red... When its oxygenated. Ask any doctor or scirnc teacher and they will tell you oxygen depleted blood is blue
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what ever you say sparky
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Science teacher*
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im so done, im just going to ignore anything else that gets commented on here. good luck ItalianStallion23
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PPR since you the only sane person here im going to follow you. Congratulations
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BrotherObscura
its blue with no oxeygen red when does how could anybody make that up. its to real to be faked
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It's running through your body black but when it comes in contact with oxygen it turns red.

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Thats actually just really dark red, it looks black but theres a red tint/pigment though. Like when in a hospital the bags with blood in them do look black but the borders are red so its just really really dark
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Oxygen Rich red blood cells are red. Oxygen poor red blood cells are blue.
White blood cells are white.

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Its either red blood cells or white blood cells, they never turn blue
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You really need to listen in health class look at your veins their blue
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your veins "appear" blue because of the light scattering properties of your skin. Your veins are really tan and all blood is a shade of red
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It varies from different hues of red.
- Why Blood Is Red

Human blood is red because it contains a large number of red blood cells, which contain?hemoglobin. Hemoglobin is a red-colored,?iron-containing protein that functions in oxygen transport by reversibly binding to oxygen. Oxygenated hemoglobin and blood are bright red; deoxygenated hemoglobin and blood are dark red. Human blood does not appear blue under any circumstances. In fact, vertebrate blood in general is red. An exception is skink blood, which appears green because it contains a large amount of the protein biliverdin.Why You Can Appear BlueWhile your blood never actually turns blue, your skin can take on a bluish cast as a result of certain diseases and disorders. This blue color is called?cyanosis. If the heme in hemoglobin becomes oxidized it may become methaemoglobin, which is brownish. Methaemoglobin can't transport oxygen and its darker color may cause skin to appear blue. In sulfhemoglobinemia, the hemoglobin is only partly oxygenated, making it appear dark red with a bluish cast. Sulfhemoglobinemia is very rare.-There Is Blue BloodWhile human blood is red, there are animals that have blue blood. Spiders, molluscs and certain other arthropods use hemocyanin in their hemolymph, which is analogous to our blood. This copper-based pigment is blue. Although it changes color when it is oxygenated, hemolymph typically functions in nutrient transport rather than gas exchange.--
(Source: http://chemistry.about.com/od/biochemistry/a/Is-Deoxygenated-Human-Blood-Blue.htm )

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well, obviously the blood we see is red. because it has oxygen in it. but without oxygen the blood is blue, which is why the vein in your arm looks blue instead of red.

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Color of vein walls is blue, not blood.
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i think you need to do more research. the wall may be blue but the blood without oxygen is also blue.
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No its not, blood is never blue, just the vein
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well, i assume your just someone that was on here earlier remade an account names imthedoctor to make it look like you know what you are talking about. so im sticking beside the many people that say its blue. my science teachers that say its blue and this picture that is from my science book showing blue blood. sorry sparky but your out.
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Wrong on all accounts, including the remaking an account, because thats a waste of time. Also theres no blue blood cells, and red blood cells don't change their entire color when oxygenated, they can change their shade
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The primary function of blood is to deliver oxygen to your body what are you talking about.
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The blood that becomes unoxygenated when it gives that oxygen out to the rest of someones body
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Blue in the body red out side of the body

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No, where'd you get this nonsense
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It's red, of course. You can see this in videos made by cameras inside of someone's body. All red...that's why we have red blood cells.

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Different shades of red. Even if blood if oxygen depleted it is red but it is a deep near purplish or bluish red. Oxygenated blood is a brighter red. I appears blue in your veins because your body acts as a color filter.

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I feel like people should google this before asking. Blood is red, with or without oxygen. The only different is the tint of red. Veins look blue, but your looking at the vein, not the blood.

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blue in comes out red

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It would only be blue if it was un-oxygenated but its actually never blue, thats your vein and it hast a color itself, blood is never blue
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Wikipedia Blood, go to 4. Color, the section HEMOGLOBIN. You will see I am right

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Wikipedia is not a viable sourse of information. anyone in the world with a computer can write what ever they like on Wikipedia claming it to be true, and sure enough there will be idiots out there that will believe it.
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He is correct either way though. Also wikipedia can no longer be changed without experts checking it and changing it back within seconds. Also if an idiot had changed it, they wouldnt have used hemoglobin, because thats not in too many peoples dictionaries
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red

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wow its blue don't belive look it up

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Yellow lol jk

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-_- wow.....
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Red what else?

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blue or purple when it doesn't have any oxygen
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Blood is always red.

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both red and blue. it is red when it is taking all the oxygen to your limbs, and it is blue when it is lacking of oxygen and is going back to the heart/lungs to get more.

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its blue inside your body but outside your body its red :P

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It is red, bright red.

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Red....

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our color of blood is red.

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Blood without any oxygen is blue and sometimes even purple and that is why our eye is the color that it is when we get a black eye and blood with oxygen is red.

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