Скачать или смотреть Human heart Structure Animation

The heart is the central organ for pumping blood throughout the body. The heart is made up of strong cardiac muscles. It is located in the chest cavity with its lower part pointing towards the left. Its size is that of the person's fist. It pumps blood rich in carbon dioxide to the lungs and oxygen-rich blood to other parts of the body.

1. The heart consists of four chambers namely the atria and ventricles.
2. The two upper chambers of the heart are known as the atrium.
3. The two lower chambers of the heart are the ventricles.
4. The left and right parts of the heart are separated by a muscular partition called a septum. The septum between the atria is called intra-atrial septum and the one between the ventricles is called intra-ventricular septum.
5. The heart has a number of valves (Mitral valve, Tricuspid valve, Pulmonary valve, and Aortic valve) that allow the blood to flow in one direction. These prevent the oxygenated blood from mixing with deoxygenated blood.
6. SA node, the natural and primary pacemaker of the heart is located in the upper wall of the right atrium in the heart.
7. AV node, the secondary pacemaker is located in the bundles of tissues on the border between the right atrium and right ventricle of the heart.
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