MICROANATOMY

Detailed explanation-1: -Oxygen-rich blood is bright red as it leaves the heart. When it returns to veins without oxygen, it turns blue.

Detailed explanation-2: -Darkened blood color is often observed in critically ill patients generally because of decreased oxygen saturation, but little is known about the other factors responsible for the color intensity. In addition, quantitative blood color examination has not been performed yet.

Detailed explanation-3: -Blood that has been oxygenated (mostly flowing through the arteries) is bright red and blood that has lost its oxygen (mostly flowing through the veins) is dark red.

Detailed explanation-4: -The color of human blood ranges from bright red when oxygenated to a darker red when deoxygenated. It owes its color to hemoglobin, to which oxygen binds.

Detailed explanation-5: -It’s bright red when the arteries carry it in its oxygen-rich state throughout the body. And it’s still red, but darker now, when it rushes home to the heart through the veins.