What is open Open circulatory system?
Open circulatory system is found in lower animals like Cockroach. It is the type of circulatory system in which the blood pumped out from heart is flows in the body cavity called Haemocoel. Then the blood again enters the heart after going to all the organs in the body. The is less efficiency in this system and the blood is called as Haemolymph and not blood in these organisms.