Arterial spray refers to the forceful ejection of blood from a severed artery. This occurs when an artery is cut or damaged, causing blood to spurt out in a rhythmic pattern, often matching the heartbeat. The pressure in arteries is higher than in veins, which is why the blood sprays out rather than oozing. This phenomenon is commonly depicted in medical training and emergency response scenarios. Understanding arterial spray is crucial for first responders, as it indicates a severe injury that requires immediate attention. Proper techniques for controlling such bleeding can be vital for patient survival.