Some heart diseases are as follows:

1. Heart block : In this condition, there are two arterial beats for each ventricular contraction.

2. Ventricular fibrilation : Different regions of ventricle contract at random.

3. Valvular defects : One or more heart valves may become constricted or do not close the opening completely.

4. Angina pectoris : It is due to the inadequate blood supply to the heart muscles as a result of arteriorclesosis severe pain occurs in the breast region.

5. Coronary thrombosis : It is the blockage of coronary artery due to the presence of a small clot or thrombus. This also leads to insufficient or no supply of blood to the heart muscles.

6. Myocardial damage : Insufficient supply of blood to the heart muscles causes damage and results in heart attack.

Fig. Human Lymphatic system

7. Rheumatic heart : Due to bacterial infection of Streptococcus viridans the tricuspid valve does not operate properly. The cardiac muscles get weakened and heart gets enlarged.