Blood in the human body is always red, regardless of how oxygen-rich it is.
- The shade of red may vary, appearing brighter red when oxygen-rich and darker red when deoxygenated.
- The common misconception that veins are blue due to deoxygenated blood is false. Veins appear blue due to the way light interacts with the skin and underlying tissues, not the color of the blood itself.
The color of blood is due to hemoglobin, a complex protein molecule found in red blood cells. Hemoglobin binds to oxygen, which gives blood its characteristic red color.
