The person which heart has prolonged high blood pressure is more prone to stroke if he isn't healthy. So there are 2 cases: If a person does sports regularly and lives healthy will have a healthy heart and will survive a high blood pressure, but if it opposite, there's a chance that he will die of stroke, because of unhealthy heart. So, actually we cannot function without a heart. The better it is, the stronger and intelligent we are. It can become better just when we are healthy.