BLOOD vascular or circulatory system can be of two types 1. Open circulatory system 2. Closed circulatory systemOpen circulatory system: Open circulatory system is present in arthropods and molluscs in which blood pumped by the heart PASSES through large vessels into open spaces or body cavities called sinuses. Here the blood is not enclosed by any blood vessel or capillary.Closed circulatory system: Annelids and chordates have a closed circulatory system in which the blood pumped by the heart is always CIRCULATED through a closed network of blood vessels. This pattern is considered to be more advantageous as the flow of fluid can be more precisely regulated.Explanation:Cockroaches are brown or black bodied animals that are included in class Insecta of Phylum Arthropoda.Their size ranges from ¼ inches to 3 inches (0.6-7.6 cm) and has a long antenna, legs and a flat extension of the upper body wall that conceals the head. They are nocturnal omnivores that live in damp places throughout the world. They have become residents of human homes and thus are serious pests and vectors of several diseases.The blood vascular system of the cockroach is an open type. Blood vessels are poorly developed and open into space (haemocoel). Visceral organs located in the haemocoel are bathed in blood (haemolymph).The haemolymph is composed of colourless plasma and haemocytes. The heart of a cockroach consists of an elongated muscular tube lying along the mid-dorsal line of the thorax and abdomen.It is differentiated into funnel-shaped chambers with ostia on either side. Blood from sinuses enter the heart through ostia and is pumped ANTERIORLY to the sinuses again. The open circulatory system of cockroachAnimalType of circulatory systemEarthwormClosedLizardClosedToadClosed