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.
In closed circulatory system blood is circulated through closed vessels such as arteries, veins and capillaries. 1. Vessels which carry blood from the heart to various body parts. 2. Arteries carry oxygenated blood from the heart except pulmonary artery.