: an exaggerated reaction to the male-oriented ''shoot-'em-up games''. noun. A movie or TV program with much gunplay and violence: gambled for cigarettes, slurped Tang or watched shoot-'emups on TV (1953+)
Circulatory system. The human circulatory system (simplified). Red indicates oxygenated blood carried in arteries, blue indicates deoxygenated blood carried in veins. Capillaries, which join the arteries and veins, and the lymphatic vessels are not shown.
1 Most veins carry deoxygenated blood, which is a darker color than oxygenated blood. The deep color of blood makes veins appear dark, too. 2  Different sizes of vessels appear different colors.  If you look closely at your veins, for example, along the inside of your wrist, you'll see your veins are not all the same color.