RED. Blood is always red.
When blood lacks oxygen, it appears dark red or maroon in color.
Human blood has red color when oxygenated which is mainly because of red blood cells. Its color changes to purple when present in oxygen deprived circumstances. To restore the color the blood has to be placed in oxygen rich environment.
Oxygen-poor blood is dark red; oxygen-rich blood is bright red.
Hemoglobin is the protein in red blood cells that carries oxygen, giving blood its red color.
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.
When blood cells have oxygen they are red, when they have no oxygen they are a darker shade of red.
red
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.
Before coming into contact with oxygen, blood is typically a dark red or maroon color.
Before coming into contact with oxygen, blood is typically a dark red or maroon color.
Blood will appear bright red when it has high oxygen content. This is because oxygen binds to hemoglobin in red blood cells, forming oxyhemoglobin, which gives the blood its bright red color.
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