Located in plant cells are large irregular shaped green structures called chloroplasts. They are green because they contain a green pigment called chlorophyll.
An open circulatory system is a type of circulatory system in which nutrients and waste are moved through the body with the assistance of a fluid which flows freely through the body cavity, rather than being contained in veins.
Before we go any further, we have to know that the heart is the most important organ in the circulatory system. The heart is considered as the pumping machine that directs blood to the different organs. Still, there is a difference in how blood is transported in an open system with that of a closed system.