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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.
What else can I help you with?
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.
Does blood change color because of temperature?
It can thin slightly in hotter temperatures and conversely thicken in colder temperatures. Blood is red and there may be very slight differences in colour in these cases but it would not be really noticeable.
Does blood change color in salt water?
Since blood is already liquid the particles would just mix together. Technically that would be dissolving.
In space what color is your blood?
In space, your blood is still red. The lack of gravity does not change the color of your blood. However, in a weightless environment, blood may behave differently due to changes in circulation.
What causes your blood to change color when it leaves your pulmonary artery?
oxygen
What color should your blood be after birth?
the of your blood after birth could be blue and red.
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
How long does it take for blood to oxidize and change color when exposed to air?
When blood is exposed to air, it typically takes around 15-30 minutes for it to oxidize and change color, turning from bright red to a darker, brownish hue.
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
