I recently had a discussion in my biology class on what color blood is.Most of my class, including my biology teacher, were saying that blood is blue until the blood comes in contact with oxygen. I'm very sure that he is incorrect and that blood is always a red. Could I have some feedback on what color blood really is and why it appears blue. I know that there are two types of blood and that venous blood is a very dark red, but NOT blue. Also that veins appear blue from that outside because of the color of skin.
I would like some reputable information on the matter, and would like to show him proof that blood is not blue.
One thing that makes no since if blood is blue is that when you have blood drawn directly from your veins into a vaccuum, the blood is still red, and it never touches oxygen. Also that oxygen is carried by blood cells, and so they would always be red anyway. I do realize that when blood cells have less oxygen it is darker than when it has lots. I researched the web on good websites for information on the topic, and all said that blood is RED. Only then when I couldn't find a good article on the topic did I decide to send this.
Please send some information on this topic so I can, as funny as it sounds, prove my 10th grade BIOLOGY TEACHER wrong.
Sincerely, Tyler Deem