: 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.
The truth is, blood does change color--from bright red to dark red--but it never turns blue. The reason blood appears blue in the veins has to do with whether or not the blood is oxygenated, the nature of blood vessels and the way light reflects off of skin.