please tell about circulatory system
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Circulatory system is basically the system that contains heart, blood vessels and blood. Transporting to different organs, required nutrients and vitamins.
Blood concerts of a fluid medium called plasma in which the cells are suspended. Plasma transports food and carbon dioxide and nitrogeneous waste in dissolved form. Oxygen is carried by red blood corpuscles. Many other substances like salts are also transported by the blood.
Heart is a muscular organ which is as big as a fist. It has different chambers to prevent the oxygen rich blood from mixing with carbon dioxide rich blood. The carbon dioxide rich blood has to reach the lungs for the carbon dioxide to be removed and the oxygenated blood from lungs has to be brought back to the heart. This oxygen rich blood is then pumped to the rest of the body.
Arteries are the vessels which carry blood away from the heart to various organs of the body. On reaching an organ or tissue the artery divides into smaller and smaller vessels to bring the blood in contact with all the individual cells. The smallest vessel have walls which are one cell thick and are called capillaries. The capillaries then join together to form veins that convey the blood away from the organ or tissue.