Describe the internal structure of heart with a neat labelled diagram.
- Internally heart is divided into four parts by septums.
- Two upper parts are called atria, and the lower ones are called ventricles.
- 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.
- 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.
- The walls Of the ventricles are relatively thicker than atrial walls.
pulmonary artery (left branch) left pulmonary veins left atrium .
semi - lunar valve in the pulmonary artery left atrioventricular valve (Bicuspid valve) left ventricle
- The largest artery is the aorta which arises from the left ventricle supplies blood to all the body parts except lungs.
- Pulmonary artery that arises from the right ventricle carries deoxygenated blood to lungs.
- The right atrium and right ventricle are connected to each other by right atrioventricular aperture.
- The left atrium and left ventricle are connected to each other by left atrioventricular aperture.
- Tricuspid valve guards the right auriculoventricular aperture and mitral valve or bicuspid valve guards the left atrioventricular aperture.