: 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.
Venous blood is darker (more crimson) than arterial blood (more cherry red). The red to dark red color of the blood is due to the large numbers of circulating red blood cells, the erythrocytes. Erythrocytes are called red blood cells because they have hemoglobin, an iron containing pigment.