BLOOD CIRCULATION : HUMAN HEART - Human heart is a muscular organ and it is the size of our fist. Heart is the central pumping and pumps blood to the different parts of the body. Heart consist of four chambers- two Auricles and two Ventricles. The chambers are named as right and left- auricles and ventricles. The heart is placed in between the lungs.The heart is protected by double wall membrane called pericardium. In between the two layers of pericardium there is the occurrence of pericardial fluid, which protect the heart from heat, shock etc.
Some of the points regarding Heart we need to know before knowing circulation , like-
Impure blood from different parts of the body reaches the heart through veins. Impure blood is also called Deoxygenated Blood.
Pure Blood from the heart reaches different part of the Aorta. Arteries carry pure blood . Pure blood is also known as oxygenated blood
Pulmonary Artery is the only artery in our body that carries impure blood.
Pulmonary Vein is the only vein in our body that carries pure blood.
Blood from the heart goes to the lungs for purification. In this case impure blood from right ventricle moves to the lungs. In the lungs purification of blood takes place. Blood from Deoxygenated become oxygenated.
Colour of the heart is brown, where as auricles are lighter than ventricles. And again out of the two ventricles left ventricle is darker. The reason behind the dark colour is that both the auricle pour its blood to ventricles which are located below the auricles. But auricles need to pump blood outside the heart.
Left ventricle is darker than right ventricle because the left ventricle need to pump blood to different parts of the body where as right auricle pumps blood to the lungs.
Transportation of blood takes place through definite vessels called blood vessels. Different types of blood vessels are Arteries, veins and capillaries.
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