3. Pneumonia is caused by viruses and bacteria wherein the alveoli in the lungs are inflamed and become filled with liquid and pus. 4. The common cold is caused by a bacteria. 5. The disease COVID-19 is caused by a new strain of coronavirus that infect people only 6. When a blood vessel in the brain gets blocked or leaked usually from a blood clot it results to heart attack. 7. Atherosclerosis is a condition that develops when a substance called pus builds up in the walls of the arteries. 8. Diseases of the blood vessels and the heart are known as cardiovascular diseases. 9. Hypertension is another name for blood clotting​