2006-07-26 19:47:38 · 21 answers · asked by DADA 1 in Science & Mathematics ➔ Biology
It doesn't .It changes shades of red .The blue is the color of the vein
2006-07-28 14:08:44 · answer #1 · answered by Anonymous · 0⤊ 1⤋
It becomes deoxygenated (lost the oxygen from it, and carrying CO2) When the blood reaches the heart again and flows towards the lungs, it will regain its colour through exchange of gases. Why the blood colour changes per amount of oxygen in it is because, in the blood, there is heamoglabin, when oxygen stored there it will give you its colour. The colour changes when haemoglobin releases oxygen found.
But the colours are around dark and light red. You never have "blue" blood, unless you're an alien!!
:)
2006-07-26 19:53:35 · answer #2 · answered by Shark_Tooth_90 2 · 0⤊ 1⤋
Well, it doesn't turn blue, like you see on the anatomy charts. The red color does dim a bit when the oxygen is expended, because the iron in hemoglobin brightens just a litle in the presence of oxygen. The reason you see blue veins in your body is because you're looking at the veins through your skin, and the veinous blood doesn't reflect light very well.
If you're really intrigued by blood, there's a neat PBS article linked below.
2006-07-26 19:57:00 · answer #3 · answered by Rondo 3 · 0⤊ 1⤋
As the blood flows around the body,during its flow many unwanted material like Urea,Carbon Dioxide etc. also get mixed with it.
That's why as the blood flows around the body it colour changes from red to bluish black.
2006-07-26 21:56:16 · answer #4 · answered by pranx 1 · 0⤊ 1⤋
Are you sure you're not confused by those charts where arteries are often shown in red and veins in blue to distinguish them? In any case, once the blood delivers the oxygen through the arteries to the muscles and organs it flows back to the heart and lungs via the veins. It may slightly have changed color because of that..
2006-07-26 19:54:38 · answer #5 · answered by Thou Shalt Not Think 3 · 0⤊ 1⤋
the more oxygen a blood cell has, the more red in color it will be. so a lack of oxygen will cause it to be blue. so it depends on which body part it is. if you bleed with no oxygen, your blood will come out blue. well, it would only work if it's like seriosuly oxygen less. like if you bleed in water, it still wouldn't work because there is some oxygen in the air. that's why some of your veins are blue around your wrist and stuff. i hope i'm right haha
2006-07-26 19:52:22 · answer #6 · answered by Elizabeth L 3 · 0⤊ 1⤋
The protein hemoglobin, which carries oxygen in the blood, changes shape when it binds oxygen. When it changes shape, it absorbs different wavelengths of light, making it change color. When blood is exposed to air, much more of the hemoglobin
absorbs oxygen than had in the vein the blood came from (in the veins, the hemoglobin has already given up most of its oxygen to the body)
2006-07-26 20:40:21 · answer #7 · answered by cookie 2 · 0⤊ 1⤋
When blood has oxygen it is red and as it goes through the body depositing the oxygen it turns to a blue-ish purple and then back for more oxygen.
2006-07-26 19:51:28 · answer #8 · answered by Naomi P 4 · 0⤊ 1⤋
Red blood cells does not have any red colour on its on. Its the haemoglobin and the oxygen that make it red. When it use up, it gradually changes the colour.
2006-07-26 20:32:24 · answer #9 · answered by kelvin low 2 · 0⤊ 1⤋
It is said to be because the blood is less oxygenated when returning to the heart via the veins, and so it is more "blue', than in the arteries where it's more 'red'
2006-07-26 19:50:29 · answer #10 · answered by artful dodger 3 · 0⤊ 1⤋
it`s all about the amount of oxygen in it,blood gets red as oxygen hits it,if you ever have given blood, youll notice it looks very dark purple when it goes into the bag, thats becuase there is no air in contact with it, its the same reason why your visible viens look blue.
2006-07-26 19:53:00 · answer #11 · answered by swamp angel 3 · 0⤊ 1⤋