: 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.
Arteries appear white because they have a thick muscular wall made of three layers and do not transmit the color of the blood. Veins, conversely, have a thin translucent wall that transmits the color of the blood inside, distorting the color slightly and making it bluish. If you look at a vein in the body you can see the blood flowing inside of it, and if air bubbles get in (from an IV or from an intentional opening of the vein) you can also see the bubbles through the wall of the vein.