The other day my friend said that are blood is blue but turns red from it being in contact with oxygen molucules.Is this true?
208929
Yes  Look at ur own veins  u can see that they are blue  Your friend is absolutely correct
421397
This is partially true, partially false.\n\nWith regards to purple, most people would agree that purple light is always some mixture of reddish and bluish light.   I.e. you can imagine two knobs, one raising and lowering the red and the other raising and lowering the blue, and you can get many shades of purple.  There may be other hues added in as well, but there is *always* red and blue (if not, we rarely call it purple).\n\nIn other words, if we didn't have the word "purple" in our language, we would probably call it something like "reddish blue" or "bluish red".\n\nBut we cannot do the same with red and green.   We have a very hard time imagining, or pointing to, a color that is "reddish green".  If given only a red and a green knob, the result will be make the color more or less neutral (gray or white).\n\nLikewise with blue and yellow.  (Some people will respond that green is bluish yellow, but that's because many people are used to mixing pigments on paper ... we're talking about mixing lights.)\n\nThese two pairs,  red-green and blue-yellow, are *fundamental* pairs.  We call them "oppositional".  (There is also a third opponent pair ... light-dark ... but as we're just talking about color here, we can ignore that one for the moment.)  This is called the "opponent theory" of color vision and is associated with Ewald Hering.\n\nSo in that sense we can call these four colors "fundamental" hues"  because all color we see can be mixed using knobs of these four colors.\n\nPeople will also wonder about the red-green-blue primaries, and the fact that we know we have red, green, blue photoreceptors in our eyes.  These would also seem to be fundamental hues (as evidenced by the computer monitor on which you are reading these words ... that monitor is able to simulate a wide range of colors using just red, green, and blue).\n\nThese two theories ... the "opponent theory" and the "trichromatic theory" competed for a long time until we found a way to reconcile them.  Basically, we have three types of photoreceptors, but they are wired in a way in our retina, that by the time signals are travelling down our optic nerve, the red-green are antagonistic signals as are yellow-blue.
398109
Blood is NEVER blue... Your veins are gray, with red blood within, it appears blue.\n\nYour face loses color due to the lack of hemoglobin, which is present in blood.\n\nThree things determine pigment.\n\nKeratin-Yellows\nMelanin-Browns\nHemoglobin-Reds\n\nEveryone has all three of these pigments present in their skin, when a light-skinned person deprives an area of oxygenated bloodflow, the red tint is removed due to the lack of hemoglobin.\n\nHope this helps!
143413
Okay.... blood, in general, no matter what species it comes from is blue when it is oxygen deficient (in our veins)... and red when it has oxygen (in our arteries)... if a snake is cut open (while alive.... or right after being killed) then all of the blood will be red, regardless if you hit a vein or artery..... because when the blood is given oxygen it turns red.\n\n-Z
674050
Fresh oxygenated blood from the closed circulatory system is rich in hemogloben and thus oxyhemoglobin and is bright red.  As it ages, decomposes, is exposed to air for a long time and is not fresh any longer, is exposed to other chemicals,etc. it turns brown.  \n\nSame is true with menstrual blood and lochia, the post partum blood. Fresh menstrual or lochia blood is red, older blood that just needs to be expelled from uterus and vagina is more brownish. Blood color is a helpful indicator of healing or bleeding.  If blood is red, it is fresh blood or a sign of bleeding leaking blood from torn blood vessels (blood that was recently circulating in the blood stream)  But if it is brownish, it is older blood and a sign that there is not any new bleeding-leaking of blood from any broken blood vessels anywhere. \n\nOn a more microscopic level ,even a few seconds of blood going from red to brown is an indication of the blood clotting mechanism taking fast effect in the skin.  Fibrinogen in the blood is a preclotting factor. Very quicly fibrinogen will be converted to fibrin protein THREADS and patch up the hole or leak because the body is able to recognize the torn, frayed edges of injured tissue.  The fibrin is like human gauze.  Its arrangement of threads across the wound form a mesh or net and block the RBCs from leaking any more so a scab can start forming and do more than stop the bleeding.  The healing, patching of the HOLE or wound can be done by cells mitosising and filling in the tear in the dermis and epidermis (epidermis is non-vascular; dermis has blood vessels). Anyway, back to the mesh of fibrin threads .... some blood serum can leak thru the fibrin threads though, with early blood clotting, so a little clearish plasma can come thru fibrin gauze instead of the prior bright red oxygenated rbcs of a fresh wound. Voila, bleeding stopped if you are not hemophiliac and have blood clotting problems.
454444
usually slightly blue due to superficial vein over there.if really green did u have bleeding or bruise couple of days back.if not i am not sure.
264416
when we breath oxygen it enter in to our blood which is called oxyhaemoglobin.it helps in circulation the fresh blood through entire body through artillaries and deocygenated blood goes again for circulation in heart through veins.
459258
It depends on the color of your blood. \n\nFor some odd reason Red State Plutocrats have Blue Blood.\n\nGo big Red Go
269579
The moon does not change colour, only our perception of the reflection of light from the sun off the moon and then through the earths atmosphere produce the colours we see. particles in the air inhibit light travel, the faster colours, ie blue, are deflected in heavy atmosphere, letting the red show through. (so a dusty night might show a red moon) for the same reason (but the other way around) the sky is blue, and so are the oceans.
263914
A bruise is blood collected under the skin.  The blood (specifically the hemoglobin in red blood cells) is initially a blue-black mark and is ingested by macrophages.  This blood is converted slowly into bilirubin which is yellow and eliminated from the body.  When roughly half of the hemoglobin is converted the bruise seems green (blue hemoglobin and yellow bilirubin) and eventually the bruise turns yellow and then back to the normal skin color.  The whole process takes 3-7 days depending on the circulation in that area of the body.
335345
The other answerers are ignorant im afraid. The majority of blood in a transfussion is red blood cells and plasma. Red blood cells do not contain a nucleus and have no DNA. They aer simply a carrier cell and as such do not need a nucleus. Plus a nucleus takes up space that could be used for haemaglobin. \n\nWhite blood cells will have DNA in them, but they will retain it. Im not certain, but im fairly sure that your own white blood cells will infact attack the white blood cells from the transfussion becasue they will have foreign antigens on them.\n\nRed blood cells are reletively short lived. I thinks its only a few days, a week at the outside. White blood cells depends on the type, but a couple of months perhaps, unless they are destroyed by your immune system.
146964
This is false. \nWhite blood cells, also known as leukocytes, are the body's defensive cells and are part of the immune system. There are different types of leukocytes, including B lymphocytes and T lymphocytes.\nB lymphocytes msture in the Bursa of Fabricius. {hence their name}\nand also include two types:\n      a) Memory B cell- these cells "remember" how to make a certain antibody in response to a particular pathogen (antigen).\n      b) Plasma B cell- secrete antibodies in order to destroy antigens. antibodies bind the antigens together to make the easier targets for the phagocytes (which "eat" them up.)\n\nT lymphocytes mature in the thymus {that's what the T stands for}. There are three kinds of T cells:\n     a)Cytotoxic T cells destroy infected cells. \n     b) Helper T cells, when activated, they proliferate and secrete cytokines that regulate or "help" effector lymphocyte function. \n     c) Regulatory T cells, also known as suppressor T cells, suppress activation of the immune system and maintain immune system homeostasis. If these fail, you get an autoimmune disease (where the immune system attacks itself!)\n\n\nOn the other hand, Red blood cells, also known as eythrocytes, carry oxygen. They have hemoglobin, which is a globular protein containing four subunit proteins found in the blood of vertebrates (organisms with a backbone). The heme group has iron in it, and this is where the oxygen binds to. This also gives blood its red color.\nRBCS are circulated by the blood.\ntheir biconcave shape (like they have a dent on both sides...) let them carry oxygen more efficiently as well. \nA disease of this, called sickle cell anemia, is when RBCs are sickle shaped and do not carry oxygen efficiently, resulting in a tired person. \nyeah.\nhave a nice day!
4150
Does iron lose magnetism when combining with oxygen?\nProbably not.\n\nIs magnetism a chemical property?\nMagnetism has a relationship with electricity. Electricity is caused by charges of atoms.\nIf a substance is insulative, current electricity will not occur but static electricity will occur.\nIf a substance is conductive, vice versa.\nTherfore, magnetism is a chemical property.\n\nHow to weaponize blood-borne iron?\nBlood is very weak in magnetism.\nI have no idea on how to weaponize it.\nProbably you need great force.\n\nConsider rechecks. These are only my guessings.\n\n\nMy friend just told me that blood is dimagnetic.\nIt means that blood opposes charges from another substances.
235073
1. When your spleen breaks down dying red blood cells, the heme from the hemoglobin is broken down into a pigment called bilirubin. The bilirubin is then conjugated with glucuronic acid in the liver to increase its water solubility and it is then excreted into the bile. Bile enters your digestive system from the gallbladder, through the bile duct and finally into the duodenum through the Ampula of Vater. Bacteria further metabolize the conjugated bilirubin into stercobilin, which gives feces the characteristic color.\n\n2. It's kind of hard to describe, but also the kind of sound you would expect form a large mammal. Take a trip to your local zoo and find out for yourself.
25719
You're right, Red+Blue=Violet.  The light doesn't have to interfere.  You don't have violet cones in your eye (you have 3 that are more or less maximally receptive at red, green, and blue)... your brain interprets equal amounts of blue and red neurons firing as the color violet.  It also interprets equal amounts of red and green light as yellow.  \n\nNow you should wonder what happens when light of 400nm hits your eye.  You don't have violet cones, but this light is not in an energy eigenstate, so you can express it as a linear combination of red and blue wavelengths... the result is that 400nm light will excite red and blue cones in equal amounts so you view it as violet.
34557
blood brothers are an interesting concept - whilst the small amount of blood shared is unlikely to cause any transfusion reactions - it may transmit HIV or Hepatitis, but there is a strange case in Switzerland where a group of girls developed antibodies despite never having been transfused or pregnant/ it was eventually discovered that they had had a blood sisters pact and shared each others blood and had subsequently developed red cell antibodies to the blood they had mixed.
309462
Yes, it is akin to asking why red is red. In fact, it is a very deep and philosophical, almost religious, question. The short answer is that it is just one of the fundamental constants of the universe. The long answer is: google for the numerous discussions on this topic.