Describe the internal stsructure of heart with a neat labelled diagram.

Explanation

1) Heart is called pumping station in human body.
2) Internally heart is divided into four parts by grooves.
3) Two upper parts are called atria, and the lower ones are called ventricles.
4) The two atria are separated from each by inter-atriolar septum and the right and left ventricles are separated from each other by inter-ventricular septum.
5) The inter-atriolar septum and inter-ventricular septum prevent mixing of deoxygenated blood in the right side of the heart with oxygenated blood in the left side of the heart.
6) The walls of the ventricles are relatively thicker than atrial walls.

7) The largest artery is the aorta which arises from the left ventricle supplies blood to all the body parts except lungs.
8) Pulmonary artery that arises from the right ventricle carries deoxygenated blood to lungs.
9) The right atrium and right ventricle are connected to each other by right atrioventricular apearture.
10) The left atrium and left ventricle are connected to each other by left atrioventricular apearture.
11 ) Tricuspid valve guards the right auriculoventricular aperture and mitral valve or bicuspid valve guards the left atrioventricular aperture.
12 ) Blood from the anterior parts of the body is collected by superior venacava which opens into right atrium.
13) Blood from the posterior parts of the body is collected by inferior venacava or post caval vein which also opens into right atrium.
14) Coronary arteries supply blood to the muscles of the heart whereas coronary veins collect blood from the heart. It also opens into right atrium.