Patient was instructed regarding functions of veins in the body as follows: Veins are blood vessels that help with return of deoxygenated blood from various organs of the body to the right side of heart. The smaller veins in the upper part of the body merge to form one large vein, superior vena cava, and drain all deoxygenated blood from the upper body, above the heart level, into the right heart. The smaller veins in [...]