2007-09-09 01:24:56 · 5 answers · asked by Tr4ck4Inc@ 2 in Science & Mathematics ➔ Earth Sciences & Geology
When we are in cold air, our circulation reduces the flow of blood near the skin surface, so that we do not lose heat. Because there is less blood near the surface of our skin, and because it is mainly veinous blood near the skin surface, we turn 'blue'; but 'less red' would be a better description. If you look at the vein in your wrist, it looks blue compared to the surrounding skin, but if you lie a blue pencil alongside it, you will see that it is actually bluish red.
2007-09-09 02:01:10 · answer #1 · answered by AndrewG 7 · 0⤊ 1⤋
Blood is never blue. Oxygenated blood is a slightly brighter red but it is never blue.
2007-09-09 08:30:13 · answer #2 · answered by Anonymous · 1⤊ 0⤋
because when our blood hits the air,the oxygen in the air turns it red.
2007-09-09 08:34:15 · answer #3 · answered by super sonic 777 1 · 1⤊ 0⤋
air has oxygen,it oxygenates the blood.color of oxyhaemoglobin is red. in absence of air haemoglobin becomes deoxyhemoglobin which looks blue.but in iron deficiency anemia people cant turn blue!because atleast 5%of hb is required to be deoxy, this much amount cant be spared in an anemic.
2007-09-09 08:38:14 · answer #4 · answered by puppet 3 · 1⤊ 0⤋
that is a myth...our blood is always red. when blood is exposed to oxygen and other gases in our air, it causes a brighter appearance (a chemical change) but it is always red. otherwise, it would appear blue in a syringe when blood is drawn.
2007-09-09 08:37:08 · answer #5 · answered by Kelli G 3 · 1⤊ 1⤋