User:Scray/Central vein

(this is just a little sandbox action - I have not done this in awhile, but perhaps it should be named "sandbox"?)

Central veins are large veins located in the chest and abdomen, distinguishing them from peripheral veins. They carry blood toward the heart, either from the peripheral veins (i.e. the Superior vena cava and Inferior vena cava) or from the pulmonary capillaries (Pulmonary veins). In physiology, the central venous blood pressure is an important indicator of preload.

Plan to link this from:
 * Peripheral vein
 * Preload
 * Central venous pressure
 * Superior vena cava and Inferior vena cava
 * Pulmonary vein