As we learnt earlier Blood transports food, oxygen and salt takes away waste materials from our body. The plasma in the blood helps in transportation of food, oxygen, carbon dioxide and nitrogenous wastes in dissolved form. The oxygen in the blood is carried by red blood cells to perform all the functions of circulation a pumping organ called heart. The blood in the body is differentiated into two types of rich contents. The prevent both types of blood mixing in the heart is divided into chambers. Oxygenated blood, which is oxygen rich content reaches from lungs to heart and distributed to rest of the past of the body.