❓ why
Why do our veins look blue under the skin?
Human BiologyCirculation
Quick Answer
Veins only appear blue because of how light travels through skin and tissue. The blood inside veins is actually dark red, not blue.
The Full Story
Human blood is always red, with the color depending on how much oxygen hemoglobin is carrying. Veins can look blue or greenish through skin because red light penetrates deeper while shorter wavelengths are scattered back differently. The skin, fat, and tissue above the vein change the way the light is reflected to our eyes. Under direct observation, or in medical procedures, veins are not truly blue.
Key Facts
1.Veins are not actually blue
2.Blood is red even when low in oxygen
3.Skin and light scattering create the blue appearance
YouTube Angle
Suggested video title for this topic:
"Why your veins look blue even though your blood is red!"