How do you get vains in your arms?

The circulatory system is made up of arteries, veins, and capillaries. Arteries are the deepest, except at the neck and groin. Veins are less deep and in some places can rise along the skin's surface, such as in the crook of the elbow and the backs of hands. Capillaries extend to the skin but are small so are mostly not noticeable. The same person can have arm veins that are deeper or more superficial when looking at both arms.
The circulatory system is made up of arteries, veins, and capillaries. Arteries are the deepest, except at the neck and groin. Veins are less deep and in some places can rise along the skin's surface, such as in the crook of the elbow and the backs of hands. Capillaries extend to the skin but are small so are mostly not noticeable. The same person can have arm veins that are deeper or more superficial when looking at both arms.