The past few weeks the question of the color of blood has come up on class. Is blood always red ? Is blood sometimes blue? Can blood change color? Thinking further what does cause something to have color? Is there color if light is absent?
Please remember to cite your sources so others may see where you gathered your information.
Blood is always red. It is never blue.
ReplyDelete" For most things colour is due to the energy levels in the compound. When light strikes the substance specific frequencies of the light are absorbed when electrons in the compound are promoted to higher energy levels, called an excited state. The colour you see is what you get when the remaining light is reflected back off the surface. For most materials the electrons drop back down to the ground state (where they were before the light was absorbed) in a number of steps giving off thermal energy as they do. Fluorescent compounds absorb light of one frequency and then drop back down to the ground state in more than one step, one of which emits a photon of light of a different frequency from that which was absorbed. In phosphorescent compounds the electron cannot simply drop straight back down to it's ground state, and so the excited state hangs around for a period of time meaning the photon of light is emitted some time after the initial photon was absorbed."
quoted from: http://www.thenakedscientists.com/forum/index.php?topic=18531.0
Blood is always red. Never blue. When it's oxygenated it's a bright red and when it's not it's a dark red. I think that the oxygen makes it darker and the color of the blood comes from what's inside it.
ReplyDeleteSite:
http://www.biology-online.org/biology-forum/about763.html
Blood changes color due to the amount of oxygen present. When the blood is blue it symbols that there is low to no oxygen present. When the blood color is red it symbols that there is quite a bit of oxygen present. Here is some examples:
ReplyDeleteLook at your veins. They are blue because there is no oxygen in your blood. Which means your blood is blue and your blood "stains" your veins.
When you bleed. Your blood is red because it is in the open air. Where their is plenty of oxygen present.
My Source:
My Brain
Human blood is red, ranging from bright red when oxygenated to dark red when not. It owes its colour to hemoglobin, a metalloprotein compound containing iron in the form of heme, to which oxygen binds. There exists a popular misconception that deoxygenated blood is blue and that blood only becomes red when it comes into contact with oxygen. Blood is never blue, but veins appear blue because light is diffused by skin. Moreover, the blood inside is dark red and exhibits poor light reflection. From a physiological perspective, veins and arteries appear similar when skin is removed and are seen directly.
ReplyDeleteSo this means blood is always red and never blue.
http://www.biology-online.org/biology-forum/about763.html
When it(blood) is in the viens it is a deeper red purple but the blue you see is the outer lining of the vein.
ReplyDeleteDeoxygenated blood is still dark blue, regardless of what color the blood vessels are. The carbon dioxide and other wastes that the cells turn the cells this color. Oxygentated blood essentially is Oxygen attracted to the Iron atom in the center of hemoglobin. Essentially, rust is what makes your blood cells red.
Well, RBC are not blue. They swing between dark red and bright red depending on whether it is carrying oxygen or not. The blue color comes from looking at your deoxygenated blood through layers and layers of skin as well as the vein itself. Rust on your blood is a good way to think of it, but remember that the hemoglobin binds oxygen loosely and the strength of the binding depends on factors like temperature.
Blood is red due to hemoglobin (the molecule that carries oxygen around) which is held in the red blood cells. In the hemoglobin are four atoms of iron which can be in an oxidized state, i.e with an atom of oxygen attached to it, making it red, or in a non-oxidized state, when it is dark red-blue (maroon).
ReplyDeletehttp://wiki.answers.com/Q/Why_is_blood_red
There are a few animals that have blue blood, most of which are cold blooded animals.
My head.
http://www.biology-online.org/biology-forum/about89.html
ReplyDeleteMany people, including myself, used to think that deoxygenated blood was blue.. This was because of those diagrams in most science books use blue to color the veins carrying blood without oxygen. I think this is very misleading and should be edited. Truth be told veinous blood is much darker than arterial blood, but it is never blue. When blood mixes with oxygen it appears much redder. The reason human blood is red is because of the iron in the haemoglobin. Horseshoe crabs have blue blood though, due to their 'copper' based oxygen binding molecule.
ReplyDeleteSources: http://www.askabiologist.org.uk/answers/viewtopic.php?id=2043
Blood is ALWAYS a shade of red. Blood can vary from bright red to a duller shade. Color is the wavelength of the light reflected off an object.
ReplyDeletewww.msu.edu/~kalinkat/professionalpages/TechMatrixMaterials/documentarybloodmisconceptions.htm#SummaryOfFindings
Delete"Blood is red due to hemoglobin (the molecule that carries oxygen around) which is held in the red blood cells. In the hemoglobin are four atoms of iron which can be in an oxidized state, i.e with an atom of oxygen attached to it, making it red, or in a non-oxidized state, when it is dark red-blue (maroon).
ReplyDeleteBlood is pumped through the lungs, where it is oxygenated. Then it travels around the body to where the oxygen is required. When the oxygen is used up, the hemoglobin is routed back via the veins, and then back through the lungs again.
When arterial blood leaves the lungs to circulate through the body, it has just a little bit more oxygen in it than does venous blood. The reason it appears bright red is that the combination of iron, oxygen, and hemoglobin absorbs higher energy wavelength light (blue and green) which leaves the red wavelengths available for our eyes to sense.
The venous blood is never blue; it is a darker color of red than arterial blood, not blue. The color is a burgundy red or maroon color. Blood is bright red in the arteries and dark red in the veins. The reason venous blood is a darker red can be partially attributed to the slightly less oxygen in the blood in the veins. But its color change is more due to the "waste" it carries away from the body tissues and back to the kidneys for filtering and elimination. This "waste" darkens the red color of the blood (think of it as a little like dirty dish water).
Although a popular belief, being in contact with air does not cause venous blood to instantly oxygenate and turn red. It is red outside the body because it is red inside the body as well. When you look at unopened veins inside the body, in endoscopy, for example, they are a dark red color.
The blue appearance of the veins that you see when looking at them through the skin is not caused by blue venous blood. As explained, that is always red. The blue appearance is caused by a reflective factor of the skin itself. It is an optical property of the reflection of light off light colored skin and the difference in that reflection from the veins under the skin (but near the surface). That reflective process is complex, but the blue-looking veins are mostly all about the skin and reflection.
If arteries were not too deep to be visible through the skin, then they, too, would have a blueish appearance, the same as the veins for the same reasons."
Read more: http://wiki.answers.com/Q/Why_is_blood_red#ixzz1kfdHylTX
Blood changes color depending on how much oxygen it has. Blood is always red, but when blood binds to oxygen it gets slightly darker red. It is always red because of porphyrin. Another misconception is that the Iron causes the blood to be red, but it is the organic molecule Porphyrin that does this.
ReplyDeleteRead more: http://wiki.answers.com/Q/Why_does_blood_change_color#ixzz1kfd7CKbH
Blood is always red. It is never blue. Blood cannot change color. When atoms or compounds absorb light of the proper frequency, their electrons are excited to higher energy levels. Colored compounds absorb visible (colored) light and this absorption is responsible for their color. Our eyes perceive a mixture of all of the colors, as in the proportions in sunlight, as white light. The following figure shows how the mixture of colors that the eye perceives as white light is separated as the light passes through a prism. So, there is no color if light is absent.
ReplyDeleteVideo we watched yesterday
http://www.chem.purdue.edu/gchelp/cchem/color2.html
"Because it lacks oxygen, the waste-rich blood that flows through the veins has a deep red color, almost like maroon. Because the walls of the veins are rather thin, the waste-rich blood is visible through the skin on some parts of the body. Look at your wrist, or hands, or ankles. You can probably see your veins carrying your blood back to your heart. Your skin refracts light, though, so that deep red color actually appears a little blue from outside the skin."
ReplyDeletehttp://www.fi.edu/learn/heart/vessels/veins.html
Human blood is red, ranging from bright red when oxygenated to dark red when not. Blood is never blue, but veins appear blue because light is diffused by skin.
ReplyDeleteFROM http://www.biology-online.org/biology-forum/about763.html
The past few weeks the question of the color of blood has come up on class. Is blood always red ? Is blood sometimes blue? Can blood change color? Thinking further what does cause something to have color? Is there color if light is absent?
ReplyDeletePlease remember to cite your sources so others may see where you gathered your information.
I always used to think that blood is blue inside us and red when it hits the air. Blood carries oxygen in our body so this really doesn't make sense. Blood is red with arterial blood being brighter and venous blood being darker. Our blood vessels have a bluish appearance through our skin but just as water going through PVC piping isn't white, blood isn't blue. Blood is red: iron, hemoglobin... Copper makes blood blue!
Check out this link... http://www.sunriseequine.com/Documents/what_color_is_blood.htm... Got some good information and some nice pics you should check it out!
the color of blood is always the reason it is blue is because it is deoxygenated blood. Blood can be both colors because of how much oxygen is in it. Light refracts and goes in to your eyes to make you see color. There is not color when there is no light because there is not as much light refracting to your eyes making everything darker and then there is no color.
ReplyDeleteBlood changes color depending on how much oxygen is in it. It is always red because of porphyrin. Another misconception is that the Iron causes the blood to be red, but it is the organic molecule Porphyrin that does this.
ReplyDeleteThe color of blood is red because of the iron and henogloboin. If it's blue it's because your blood has copper in it. The blood is sometimes blue, but not in humans.
ReplyDeleteThe past few weeks the question of the color of blood has come up on class. Is blood always red ? Is blood sometimes blue? Can blood change color? Thinking further what does cause something to have color? Is there color if light is absent?
ReplyDeletePlease remember to cite your sources so others may see where you gathered your information.
Blood is blue and then it goes through the heart and goes flub dub then it turns red
Recources...MY BRAIN...bkuz i m smart
the color of blood is blue when it's in your vein's but when you cut yourself the oxegyn leave's the blood and turn's it red
ReplyDeleteI think its some blue and some red blood
ReplyDeleteBlood is blue inside us and then it turns red when it hits the air. Blood is red with arterial blood being brighter and venous blood being darker. Our blood vessels have a bluish appearance through our skin but just as water going through PVC piping isn't white, blood is blue.
ReplyDeletehttp://www.sunriseequine.com/Documents/what_color_is_blood.htm
No blood is not always red. un-oxygen rich blood is blue until it has been replenished by coming back around through the heart. Yes blood can change color because as oxygen rich blood runs through your body it turns blue as the nutrients in it are being used up. Depending on the lighting, whether your using natural light from the sun, black lights, or flouresent lights(like the ones that your have on your celing or your desk), so if light were absent, we wouldn't be able to see any colors at all, no matter what you were looking at.
ReplyDeleteBy Jasmine Mason
DeleteYour blood isn't always red.It is true that your blood is sometimes blue.Yes blood can change color.The cause of the color change depends on the ammount of oxygen rich blood.
ReplyDeleteMy information came from the book page 65.
blood can change colors it can be red and blue
ReplyDeletewhen it is viens its blue when its not its red
DeleteRed blood is oxygen rich and blue blood is not oxygen rich
ReplyDeleteThe past few weeks the question of the color of blood has come up on class. Is blood always red ? Is blood sometimes blue? Can blood change color? Thinking further what does cause something to have color? Is there color if light is absent?
Please remember to cite your sources so others may see where you gathered your information.
The color of blood does not change. It is always red. It may appear as blue, but this is the color of your veins.
ReplyDeleteAs for color, it's a matter of selective absorption and reflection of the varying wavelengths of light. Our eyes and brain work together to interpret the different wavelengths of light as different colors. White light is composed of all possible wavelengths of visible light, and sunlight is very nearly white.
Blood is not always red. Yes blood is sometimes blue. yes blood can change color. The items that make it up. No there is no color if light is absent.
ReplyDeleteif you breathe right then you have red blood when you get less oxygen your blood turns blue.
ReplyDeleteFrequently the answer is "blood is blue inside us and red when it hits the air". Blood carries oxygen in our body so this really doesn't make sense. Blood is red with arterial blood being brighter and venous blood being darker. Our blood vessels have a bluish appearance through our skin but just as water going through PVC piping isn't white, blood isn't blue. Its just the vein.
ReplyDeletehttp://www.sunriseequine.com/Documents/what_color_is_blood.htm
DeleteThe color of blood is purple until it hits oxygen then it turns red.
ReplyDeleteBlood is red when it has oxygen in the blood cells and blue when there is no oxygen.
ReplyDelete