Is blood blue or red?


Is Blood Blue Or Red?  

497 members have voted

  1. 1. Is Blood Blue Or Red?

    • Blue
      104
    • Red
      393


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Blood is colorless.

The red bloodcells give it color.

I thought it was purple, not blue.

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:yes:

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I was taught red blood cells + oxygen = red, red blood cells - oxygen = blue

Red blood cells turn blue because they start to die when they don't have oxygen.  Therefore you can never test and catch blood off guard (mostly) because once it comes in contact with oxygen it turns red again. 

Also fyi blood gets oxygenated in the lungs and then pumped by the heart to wherever.

(oh and the reason why blood is still red when they take it from you is beacuse the oxygen is not being used)

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People! Whole blood is red. Oxygenated blood is a brighter shade of red than deoxygenated blood. During veinipuncture, when blood is collected by syringe or Vacutainer system, negligable O2 comes in contact with the blood. Vacutainer tubes are glass tubes sealed with a negative pressure. The blood that is flowing inside your veins is the same colour and consistancy as the blood flowing through the shaft of the needle and into the blood collection tube. Wtf is this "you can never test and catch blood off guard..."??

Also, blood is NOT colourless. Whole blood is RED. Red blood cells are RED. Serum/plasma is a pale straw colour and transluscent normally. Individuals with jaundice have high levels of bilirubin in their plasma causing the whole blood to look brown and their serum to look darker yellow (icteric). Individuals with high levels of circulating lipid can have lipemic blood. Lipemic plasma is milky white and viscous.

(oh and the reason why blood is still red when they take it from you is beacuse the oxygen is not being used)

I have no idea what you are trying to say here. This makes no sense to me at all.

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Arg... So many experts and no doctors or biologists.

It's always red. When it's not carrying oxygen, it looks dark red. When it has oxygen, it looks bright red. Next time you get blood drawn, look at the blood in the needle: Dark red. Now go give yourself a paper cut. Bright red. Problem solved.

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Arg...? So many experts and no doctors or biologists.

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I am a medical laboratory technologist (MLT). I also have a BSc. in cellular biology/genetics. I perform venipuncture for a living. I analyze the bejezus out of blood, tissues and all body fluids that come from the body for that matter. I see more human blood in a day than the majority of the people on this board will see in a lifetime.

Edited by sniffles
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I am a medical laboratory technologist (MLT). I also have a BSc. in cellular biology/genetics. I perform venipuncture for a living. I analyze the bejezus out of blood, tissues and all body fluids that come from the body for that matter. I see more human blood in a day than the majority of the people on this board will see in a lifetime.

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Then go suck all the blood out of the people who think blood is blue.

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  • 1 month later...

I do not know if my message got posted , so I repeat , forming blue patches small in skin hands, or legs or in the knees is due to what, not hurt anywhere , simply developing blood patches in blue and red in color , doctor suspected VASCULITIS , Is that so , another dr said not VASculitis , then what it is why it ahppens to 11 year old boy . Is it to be worries or simply forms and nothing to worry .please help.

sre

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Blood is colorless.

The red bloodcells give it color.

I thought it was purple, not blue.

585853761[/snapback]

Im with you on that..easiest to say it has no colour ;)

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People! Whole blood is red. Oxygenated blood is a brighter shade of red than deoxygenated blood. During veinipuncture, when blood is collected by syringe or Vacutainer system, negligable O2 comes in contact with the blood. Vacutainer tubes are glass tubes sealed with a negative pressure. The blood that is flowing inside your veins is the same colour and consistancy as the blood flowing through the shaft of the needle and into the blood collection tube. Wtf is this "you can never test and catch blood off guard..."??

Also, blood is NOT colourless. Whole blood is RED. Red blood cells are RED. Serum/plasma is a pale straw colour and transluscent normally. Individuals with jaundice have high levels of bilirubin in their plasma causing the whole blood to look brown and their serum to look darker yellow (icteric). Individuals with high levels of circulating lipid can have lipemic blood. Lipemic plasma is milky white and viscous.

I have no idea what you are trying to say here. This makes no sense to me at all.

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I will agree with you.

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blood is red..never blue...

it can change from dark red to really bright red - if its oxygenated it will be bright red..if its deoxygenated it will be dark red :ninja:

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Yes as Kompressor said it is bright red and dark red, this is because Haemoglobin contains a prothetic group of Iron which when combined with oxygen gives an Iron(III) complex and without oxygen an Iron(II) complex, for those who take chemistry you will be able to tell me the difference in colors of the both of those...

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I think people confuse the color of Veins with the color of blood

Veins = blue

Arteries = red

pasma = color less

Red blood cells = make blood red

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  • 4 weeks later...

blood is always red not matter whether its oxygenated or not. the red substance is the haemoglobin which are found in red blood cells. blood consists of many things these are dissolved substances, red blood cells, hormones and placelets. All these float on a fluid called 'plasma'. Some ppl make common mistake saying that blood with no oxygen is blue. But the truth is that they are red and if u ask me why it is blue in textbooks...it is becuz they want you to tell da differnce!

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The theory that blood is blue when its not oxygenated doesn't make sense anyway, because doesn't blood carry oxygen to your muscles? So it?s always "oxygenated".

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The theory that blood is blue when its not oxygenated doesn't make sense anyway, because doesn't blood carry oxygen to your muscles? So it?s always "oxygenated".

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What do you think the oxygen is for then? It is used by the muscles in the respiration process: Glucose + oxygen -> carbon dioxide + water.

Blood will always be red as the red pigment (haemoglobin) is never lost from the blood and is essentially what the RBC's are made from.

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I can't believe this thread is still going.

BLOOD IS RED PEOPLE!!!!!!!!!

RED!!!!!!!!!!!!!!!11111111

ps: IT IS NEVER BLUE, IT'S DARK RED WHEN DE-OXYGENATED!!!!!

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The theory that blood is blue when its not oxygenated doesn't make sense anyway, because doesn't blood carry oxygen to your muscles? So it?s always "oxygenated".

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No its not always oxygenated. The blood becomes oxygenated by the lungs, it then travels to the heart and gets pumped throughout the body by way of arteries. Once the blood reaches muscle, organs, and general tissue and cells it dumps off the oxygen. On the way back it is unoxygenated and travels back to the lungs via the veins to be re-oxygenated. And the whole process starts again. So oxygenated blood is bright red and unoxygenated blood is NOT blue but more of a dark burgundy. This is the simplified and crude version of the circulatory system.

Edited by Nexus
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Your heart constantly pumps blood throughout your body. Red blood cells take oxygen from your lungs to all the other cells in your body. The oxygen makes red blood cells look bright red. Once the cells have delivered this oxygen, the red blood cells look dark blue or purple. There are two types of blood vessels -- arteries are the blood vessels that carry oxygen-rich, bright red blood away from the heart, and veins are the ones that return oxygen-poor, dark blue blood back to the heart and lungs. Arteries are deeper inside your body, while veins are closer to the skin. So those blue blood vessels you see on the back of your arm are veins taking blood back to the heart and lungs to get pumped up with oxygen!

http://yahooligans.yahoo.com/content/ask_e...page?d=20020829

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