Also known as blood points, they play an important role in the flow of blood and energy in qi circulation as they're composed of meridian channels and associated vessels for qi. There are two major types of acupoints or blood points, which are the Critical Acupoints and the Reservoir Acupoints. The critical acupoints are also called paralysis points since, if the point is strike or poked, it can paralyze the person, causing momentary or prolonged immobility of the body.