Blood circulation in human body

The heart is a main pumping organ of our body. It helps to distribute the blood to all parts of the body. The heart is made up of special tissues known as cardiac muscles. It is able to pump the blood by rhythmic contraction and relaxation of its muscles. The blood circulation in a human body is double circulation. It involves the circulation of blood from heart to other parts fo the body except lungs and the circulation between heart and lungs. This means that the blood passes through the heart twice for each circulation of the body. Thus, there are two types of blood circulation in human body.
(i) Systematic circulation
     It is defined as the circulation of blood fom heart to all parts of the body except the lungs. 
First, the pure blood is collected in the left auricle pushes the blood in the left ventricle. When the ventricle contracts, the pure blood is passed to the aorta thtough aortic valve. Then this pure blood is distributed by arteries and arterioles in different body parts. After that the pure blood reaches to capillaries where exchange of blood takes place i.e. blood becomes impure. Then this blood is carried by venules, vein and venecava and passed to the right auricle.

(ii) Pulmonary circulation
      It is defined as the circulation of blood between heart and lungs.
The inpure blood collected in the right auricle is passed to the right ventricle through tricuspid valve. Then this impure blood on the right ventricle is pumped to the lungs for purification through pulmonary artery. In the lungs, the blood purification process is takes place and the pure blood is passed to the left auricle through pulmonary vein. Then the left auricle passes this pure blood to the left ventricle through mitral valve.
By this process, the whole blood circulation process is completed. During blood circulation, the blood is flow in high pressure in the artery  and in low pressure in veins. Due to that the wall of artery is thicker than the wall of the vein.
Location:Kathmandu, Nepal Kathmandu 44600, Nepal

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