IF the blood vessel will not work :
You can have this three serious health problems.
1. Chest pain (Angina). When you have this symptom, you feel pain in your chest, arms, shoulders, or back.
2. Heart attack. A heart attack appears when the blood vessel blocked near in your heart, then causing damage to the heart muscle.
3. Stroke. A stroke happen when the blood supply to your brain is blocked, causing your brain damaged.
Hope this answer will help you :)