Oxygen is exchanged between lungs and tissues using the heart to pump it round the body in the blood. what else is transported to tissues in the blood?

during gas exchange oxygen moves from the lungs to the bloodstream at the same time carbon dioxide passes from the blood to the lungs this happens in the lungs between the alveoil and the network of tiny blood vessels called the capillaries which are located in the walls of the alveoli

dogs is better and probably lizards.