Question

why do some blood vessels look blue when you look at them through your skin?
the way that light moves through your skin makes those blood vessels look blue, but all blood is actually yellow.
those are arteries that are carrying oxygenated blood.
those are veins that are carrying deoxygenated blood.
the way that light moves through your skin makes those blood vessels look blue, but all blood is actually red.

Explanation:

Blood is red due to hemoglobin. Veins carrying de - oxygenated blood can appear blue through the skin because of the way light interacts with skin and blood. Shorter - wavelength blue light is more easily scattered by skin tissue, while longer - wavelength red light penetrates deeper. When we look at veins through the skin, more blue light is reflected back to our eyes, making the veins appear blue.

Answer:

The way that light moves through your skin makes those blood vessels look blue, but all blood is actually red.