i have one teacher that says that blood is red and my other teacher says its blue or green( i dont know exactly) it only turns red when it has contact with oxygen. so what is it?
2006-11-29 13:02:24 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Blood without oxygen in it is dark blue. It turns bright red when it contacts oxygen, either by leaving the body through a cut or by recieving oxygen from the lungs. If you cut a vein (which transports deoxygenated blood to the heart and lungs for refueling) the blood will come out almost black for an instant before it hits the air.
If you look at your veins in places where they're easily visible, like your wrist, you will see that they appear blue, not red.
2006-11-29 13:05:22 · answer #1 · answered by Amy F 5 · 0⤊ 0⤋
Blood is actually a clear to pale yellow substance due to the presence of plasma. However, red blood cells contain a protein known as haemoglobin, which, when combined with oxygen, turns to a bright red colour. This makes blood appear red.
2006-11-29 14:57:33 · answer #2 · answered by need2know 2 · 0⤊ 0⤋
See for yourself. Look at the backs of your hands. The veins are blue with de-oxygenated blood returning from the tissues. Get a little scratch, and you'll see blood is mostly bright red. Of course, veinous blood is not truly blue-blue. It's just not as red.
2006-11-29 13:08:41 · answer #3 · answered by steve_geo1 7 · 0⤊ 0⤋
blood consists of a few components - red blood cells, white blood cells and platelets. Red blood cells carry oxygen so it appears red, therefore blood looks red. however once the oxygen is pass through the body, it loses its redness. i believe that it doesn't turn totally blue but just due to loss of oxygen, it looks pale. when you cut your vein, the blood will not come out blue, its still red but darker and dull in colour. blood rich in oxygen is bright red. scientifically, if you leave blood in a testube for days, it will separate and you will see a yellowish substance, that is the fluid that all the components flow in
2006-11-29 13:29:06 · answer #4 · answered by zaraki 3 · 0⤊ 0⤋
Ok, blood in arteries is a dark dark red color. This is because of oxygenated hemoglobin (heme contains an ferric ion). When it gets exposed to air (when you bleed), it turns a bright red color. VENOUS blood contains DEOXYGENATED hemoglobin. Blood with deoxygenated hemoglobin is a dark dark mud-like color. It appears blue, but its not the blood thats blue, its actually the veins themselves that APPEAR blue with blood flowing through them.
2006-11-29 13:08:20 · answer #5 · answered by Brian B 4 · 0⤊ 0⤋
There are different things that cause the blood to be red. This site will help you understand the basics or serology.
2006-11-29 13:12:18 · answer #6 · answered by Anonymous · 0⤊ 0⤋
blue till it hits oxygen then it turns red.
2006-11-29 13:08:16 · answer #7 · answered by bearcatz_07 4 · 0⤊ 0⤋
Hell I dont know. I jus know if I put a flashlight in my mouth my jaws are red...
2006-11-29 13:11:09 · answer #8 · answered by C. Nicole C. 3 · 0⤊ 0⤋
Because our blood is iron based it is RED.
If it where copper base it would be Green.
2006-11-29 13:14:04 · answer #9 · answered by Monita Marler 4 · 0⤊ 0⤋