The color of blood depends on how much oxygen is in the blood; when here is plenty of oxygen, the blood is more reddish in color.
First thing: Blood is *never* blue. Blood is described as dark red (venous) or bright red (arterial). Our veins look blue because we are looking at them *through* our skin. The blood inside them is dark red and it doesn't reflect light very well. The blood you see when you get hurt is usually venous blood. Also, since the blood in your body is a lot darker, the veins appear darker. You may also notice that different sized blood vessels appear to be different colors. Another thing it can depend on is how you see color and how your brain perceives certain color against the color of your skin. Deoxygenated blood is a darker shade of red, which can be seen during blood donation and when venous blood samples are taken. However, due to an optical effect caused by the way in which light penetrates through the skin, veins typically appear blue in color. You have a good question. The color of blood depends on how much oxygen is in the blood; when here is plenty of oxygen, the blood is more reddish in color. The reason that this is so is because of a protein called HEMOGLOBIN, which carries the oxygen in your blood. When hemoglobin has a full oxygen load, it gives the blood a reddish color. Answer 7: Your blood is actually always red! Blood in your veins has very little oxygen and is a dark red color that looks almost blue when covered by your skin. Your arteries have bright red blood because it has a lot of oxygen in it that is being carried throughout your body to be used by tissues. Our blood is red but our veins are blue so many people assume that the blood is blue and then hits the air and changes color. Not true. See this article. Blood has red blood cell, while blood cells and etc.... Venous blood is bluish because it is oxygen depleted which results in a blue color. The veins that carry the venous blood are just under the skin hence this is the blue blood you see. The arterial blood is carried in the arteries which are deep in the body and not seen through the skin. Blood is always red, actually. Veins look blue because light has to penetrate the skin to illuminate them, blue and red light (being of different wavelengths) penetrate with different degrees of success. What makes it back to your eye is the blue light.
http://www.globalclassroom.org/blublud.html http://scienceline.ucsb.edu/getkey.php?key=2927 http://www.answers.com/Q/What_color_is_blood http://scienceline.ucsb.edu/getkey.php?key=2927 http://scienceline.ucsb.edu/getkey.php?key=2927 https://answers.yahoo.com/question/index?qid=20071026063113AAs4ijP http://scienceline.ucsb.edu/getkey.php?key=2927 http://www.livescience.com/32212-if-blood-is-red-why-are-veins-blue.html
what color is our blood