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If you are referring to why blood goes from bright red in the aorta to a darker reddish-purple in the pulmonary artery, the answer is because the blood has lost the majority of the oxygen it was carrying. This causes a conformation change in the carrier hemoglobin, which results in a color change.
If you are referring to another color change in the blood (such as why a particular animal's blood is chocolate brown, for example), this would be due to a toxicosis and the animal should be taken to a vet immediately.
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Why does capillary change color as it passes by your body cells?
Capillaries change color as they pass by body cells as the blood they contain loses oxygen. Oxygen-rich blood has a brighter color than oxygen-poor blood.
What causes your blood to change color when it leaves your pulmonary artery?
oxygen
Why does blood change color at the lungs?
Blood changes color at the lungs because it unloads carbon dioxide and absorbs oxygen. Red blood cells that are carrying oxygen are a brighter red color than red blood cells that are depleted of oxygen.
What color are vaginal blood clots?
Most vaginas with infections show no change in color. Trichomoniasis or candida can cause red vaginal skin.
When do vampires eyes change colors?
vampires eyes change color when they are either a newborn or when they had drank a humans blood
Why your skin color change when you cold?
You skin changes color when it's cold because blood can't flow as easily.
Why does skin change color when bit by a fiddle back?
because when bit blood rushes tho the area causing swelling. and with all of the blood there the skin then turns color on the account of the extra pressure added from the blood
Does luminol change a different color when it makes contact with animal blood?
No it stays blue, it only turns blue in the presence of blood
When testing for occult blood using hemoccult the presence of blood is indicated by adiscolortion around the perimeteer of a smear?
After the hem-occult card is prepared, and the reagent is dropped on to the specimen, if blood is present there will be a color change resembling that of the positive control. The color change isn't necessarily limited to the perimeter of the drop.
What causes beef to change color?
the gas used to process the meat or the oxygen has expired from the blood cells
What causes a bruise?
It is caused by a bunch of broken blood vesseles, causing the color of a bruise to change.
Why does blood change colors when it leaves the body?
Blood changes colors when it exits from the body because it touches the air, thus causing blood to change colors. The oxygen changes the color mostly, but I'm sure they're are other factors too.
