Do cockroaches have an open circulatory system?

Answer: Insects have such an open circulation system, which is distinct from the enclosed circulatory system found in people and other animals in terms of both anatomy and function. In an open platform, all internal organs and tissue are in contact with the blood, also known as haemolymph, as it circulates freely throughout bodily cavities. Instead of having blood capillaries and channels for transportation, they have a region termed the haemocoel where blood is present. The haemocoel bathes the body organs.