The main difference between arterial and venous bleeding is the point of origin. UCSB ScienceLine explains that arterial bleeding originates from the damaged arteries while venous bleeding means losing the blood from the veins.
One of the most significant differences between these types of bleeding is the severity, according to the Stony Brook University. The arteries are under high pressure, so the blood gushes out rhythmically with the heart beat, making the bleeding very dangerous and hard to control. The veins, however, are under low pressure, causing a slow and steady bleeding.
According to Wikipedia, the blood color can also help determine the type of bleeding. Arterial blood that is rich in oxygen is bright red, while venous blood is dark red.