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Human heart is the hollow muscular organ of the body which pump and supply the blood throughout the circulatory system. It is located a little to the left of the middle of chest. Heart is very sensitive organ and more responsible for life, so it covered with the rib cage to protect any injury. The weight of heart is about 240 grams and the size of heart is about a fist.  Structure -   The structure of heart is divided into two parts- Exterior structure and Interior structure.  1) Exterior structure -  Heart is made up of three layers of tissue- Pericardium, Myocardium and Endocardium.  i) Pericardium - is the outer layer of heart. It is made up of two layers Outer parietal pericardium and inner visceral pericardium. Between these layer their are potential space called pericardial cavity. This Pericardial cavity contain up to 50ml of pericardial fluid. This fluid keeps the heart moist and reduce the friction between heart wall and surrounding tissue, when the he...

Arteries 1) Arteries distributes blood from Heart to Body.  2) The flow of blood is fast due to heart beats. 3)  Arteries contain aerated blood. 4) In arteries their are no valves present in it. 5) Arteries become empty after the death of organism.  6) The tunica media is thin, because it contains fewer muscle fibers and elastic fibers.  7) Lumen in arteries are narrow. Vein 1 ) Veins brings the blood from Body to Heart. 2)  The flow of blood is slow.  3) Veins contain non-aerated blood.  4)  Veins contain valves, to prevent back flow of blood.  5) Blood is still in vein after death of organism.  6)  The tunica media is thicker than arteries, because it contain more muscle fibres and elastic fibres.  7) Lumen in veins are wider than arteries.