if you cut a vein open where there was no oxygen would you bleed blue?
929317
NO\n\nBlood is red no matter how much oxygen is in it, it just changes to a different shade
898825
It doesn't turn red when it is exposed to oxygen.  It is red.  What you see through your skin is the color of the veins.\n\n\nIt turns out that hemoglobin has a red color to\nit and that oxygenated hemoglobin is bright red.  So in arteries blood\nappears to be bright red.  This is true inside and outside.  Outside of the\nbody the color actually fades a bit (becomes darker), because there is less\npressure to keep oxygen associated with the hemoglobin.  But if you cut an\nartery the blood squirting out will appear bright red.  Blood that is in\nveins, however, has very little oxygen associated with it and this yields a\ncolor that is much darker.  As you noted, because of having to look through\nthe skin at veins they actually take on a blue tint, but really the blood\ninside (and if you cut a vein) is just a deep shade of red.  You can also\nsee this in persons that have stopped breathing or have blood flow blocked\nto a specific area; they appear blue. (A condition referred to as cyanosis.)
637537
It's actually a bluish-green.  Look at your veins that come to the surface of your skin.  Blood only turns red when it comes into contact with oxygen.
65667
The color of blood is blue.
426679
Technically if done right the person would never die. There is nothing fatal to small cuts, especially if there is little or no blood involved. A person can survive losing up to 30% of their blood, any amount beyond that would result in death if not replenished quickly. The average person has 7 liters of blood so you can image it would be a quite substantial amount, roughly 2.1 liters that you'd have to lose to die. I am bored and will do some math for you, I am guessing that a paper cut releases approximately 1ml of blood on average. That would be 2100 cuts. But then again not all paper cuts bleed, and it also depends a bunch on the physical level of the person being cut, if they are older they may have trouble developing clots and may be done in by 1/4 as many cuts due to uncontrollable bleeding. I advice not trying this out as you are almost guaranteed to get some sort of infection even if the cuts do not harm you.
291305
Depending on where you are stabbed, you could be paralyzed (from spinal cord severing), dead from a heart penetration, a pneumothorax (collapsed lung) with serious respiratory failure, serious bleeding wound from a kidney wound, etc.\n\nThere are so many sorts of injuries, it is impossible to define with the information you provided.
649361
We get "Black & blue marks" when capillaries (the smallest blood vessels) are broken, such as with a forceful blow.  Venous blood (that is, the blood in veins) is dark and has a bluish-red appearance.  When the fragile venous capillaries are broken this dark blood seeps out under the outer layer of skin.  And that's why we get black & blue marks.
738968
I fell on ice last year walking out to my car and I cut the tip of my chin on the ground - I got a small cut and it bled like crazy.  I felt like an idiot.  But nobody saw me.  At least that I know of.
321801
If there is any blood present yes.
709372
I'm not going to ask you how you got your cut, because, you've already told me.  Anyways, the nurse in me needs to tell you that you should seek medical attention, for a couple of reasons.  The cut could get seriously infected, and you need someone to talk to about why you feel the need to hurt yourself, or the fact that someone else hurt you.\n\nAs for the cut itself.  It is extremely important that it stay clean. The edges of the cut need to stay together in order to heal.  If there are no stitches there will be a scar.  The continuous blood suggests a large deep wound.  If the surrounding skin is turning pink or red, and is warm to the touch  you must get help as this is  called cellulitis and can lead to blood poisoning.  This is when the wound gets infected and the bacteria enters the skin, and then the bloodstream.  This can be fatal.\n\nA cut this size and this deep really isn't something to hiding.  Please try to get someone to help you get some medical attention.\n\nI know that you are probably scared, but I'm sure that there is someone that you can trust.  If you are afraid that the ER will ask too many questions, then go to an urgent care center.  Come up with a plausible story, or another name for that matter. But for heavens sake, get someone to sew up the wound so you can heal the wound.  Good luck and God speed!
1027432
I highly doubt it.  You would probably bleed profusely.  Check with your doctor, only.  Don't rely on the tattoo artist.
228065
Look down there..\nThe *.pdf is most detailed and informative.\n\nI am stunned at the total lack of sense displayed by some of these answers! Blood is red! Oxygen poor blood is more 'purpley' in colour but not blue. NONE OF THE BLOOD CIRCULATING INSIDE YOUR BODY IS BLUE!!!
628386
Yes.  Sometimes the blood isn't very red at the beginning and the end.  Expect it to be weird before it gets regular- just keep supplies with you just in case and keep track of it.
205088
I have not, but am a nurse.  The postoperative pain should be only at the venipuncture site..and should be minimal.  Very short recovery period.  They should watch the patient for chest pain, and will probably do a stress test, to make sure the vessel is open.
452331
This is sort of a myth, with some exceptions.  I remember as a kid hearing that a single bubble of air would kill you.  This is simply not the case.  A small bubble in your vein is not harmful.  Now if you send a large bubble of air back to your heart, you create an air embolism.  Air takes up space and in an enclosed area, like a blood vessel it can get lodged and can prevent blood getting past it.  Even then it may not kill you, but it could cause an infarct (lack of blood/O2 supply causing cellular death)
441575
Blood is not blue.  They just draw it that way in science books so you can distinguish arteries from veins.  You can take this to the bank.
877997
Ask a doctor about that when you go to the hospital for losing all that blood.\n\nJust kidding I hope.\n\nReally though, it just depends on the health condition of the person and the physical makeup of the person and I don't know you so I can't tell you the effect it would have on you.