What Color is Your Blood?

The video explores the common misconception that human blood is blue until exposed to air. It explains that blood is always red, with its color influenced by oxygenation levels. The video also discusses the composition of blood, including plasma, red and white blood cells, and platelets. It highlights how different organisms have varying blood colors due to different proteins, such as hemocyanin in mollusks and hemerythrin in marine worms. The video concludes by clarifying that human blood appears blue in veins due to light wavelengths, not because it is actually blue.

What role does hemoglobin play in determining the color of blood?

Describe how the blood of certain mollusks differs from human blood.