2006-07-12 17:50:27 · 11 answers · asked by jaya s 1 in Science & Mathematics ➔ Biology
The veins of the body are three layers thick. They contain muscle and connective tissue. So they are not transparent. We cannot see the blood because of this anatomy. The veins are not even blue but a white color. They look blue-green due to the reflection of light off of a persons skin. The less pigment a person has the bluer it looks. The more pigment present the darker blue it appears. It is almost like the question why is the sky blue when we know it is black in space. Light plays many tricks on our eyes and we can't always believe what we see.
2006-07-13 03:40:51 · answer #1 · answered by ATP-Man 7 · 0⤊ 0⤋
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. Arterial blood comes out in spurts. It spurts every time the heart beats. I hope you never see that.
2006-07-12 17:54:48 · answer #2 · answered by FireMedic 3 · 0⤊ 0⤋
The oxygen level in the blood is different between arteries and veins. Blood drawn from a vein is also red but appears slightly "blue-er" than the highly oxygen-enriched blood in an arterie.
2016-03-27 03:23:38 · answer #3 · answered by ? 4 · 0⤊ 0⤋
in fact, the venous blood isn't blue, it is dark red... it is known that the veins carry the deoxynated blood ....
when heamoglobin in the RBCS combine with carbon dioxide it is converted into dark red dicarboxiheamoglobin....
that's why venous blood is darker than the artrial blood.....
2006-07-13 02:58:31 · answer #4 · answered by irumi 1 · 0⤊ 0⤋
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.
2006-07-12 17:55:03 · answer #5 · answered by Man 6 · 0⤊ 0⤋
It's actually a very dark red and looks blue through the many layers of skin.
2006-07-12 17:53:53 · answer #6 · answered by Anonymous · 0⤊ 0⤋
because it lacks oxygen. Veins carry blood to the heart and lungs to be oxygenated and arteries carry oxygenated blood through the body...
2006-07-12 17:53:32 · answer #7 · answered by blkrose65 5 · 0⤊ 0⤋
Because it is blue, it turns red with first contact of air.
So why is the the person below me felt she needed to type the exact same answer?
2006-07-12 17:52:42 · answer #8 · answered by SigEp84 3 · 0⤊ 0⤋
I HAVE AN ANSWER TO UR QUESTION-;
1]VIENS CARRY IMPURE BLOOD IE.,THEY CARRY BLOOD WHICH IS TO BE OXYGENATED AS A RESULT THEY APPEAR DARK RED WHERE AS ARTERIES CARRY PURE BLOOD IE.,OXYGENATED BLOOD SO THEY APPEAR BRIGHT RED.
HAVE U GOT A GOOD IDEA ABOUT MY ANSWER.
2006-07-12 17:59:26 · answer #9 · answered by amey d 2 · 0⤊ 0⤋
It only turns red when there is oxygen present in it, such at the surface of a cut.
2006-07-12 17:52:48 · answer #10 · answered by lovin' life 3 · 0⤊ 0⤋