EVERYDAY SCIENCE

Detailed explanation-1: -It is a common myth that veins are blue because they carry deoxygenated blood. Blood in the human body is red regardless of how oxygen-rich it is, but the shade of red may vary. The level or amount of oxygen in the blood determines the hue of red. As blood leaves the heart and is oxygen-rich, it is bright red.

Detailed explanation-2: -Veins look blue because of the way our eyes process light waves and color. When red light hits your skin, its longer wavelengths reach deep into where your veins are located. The red blood in veins absorbs the light. Blue light doesn’t travel as deep as red light does due to its shorter wavelengths.

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. Anyone who has donated blood or had their blood drawn by a nurse can attest that deoxygenated blood is dark red and not blue.

Detailed explanation-4: -Human blood is red in colour, ranging from bright red when oxygenated to a very dark, almost blackish-red when deoxygenated. It owes its colour to haemoglobin, to which oxygen binds. Deoxygenated blood is darker due to the difference in colour between deoxyhaemoglobin and oxyhaemoglobin.

Detailed explanation-5: -Blood vessels which carry deoxygenated blood are called veins except for the pulmonary vein.