Blood Pressure

I am very interested in blood pressure because it’s something very dangerous and it’s safe to know the symptoms. High blood pressure is a serious condition that can lead to coronary heart disease, heart failure, stroke, kidney failure, and other health problems. Blood pressure is the force of blood pushing against the walls of the arteries as the heart pumps out blood. If this pressure rises and stays high for a long period of time, it can damage the body in many ways. I would like to learn how blood pressure damages the inside of your body.
      Blood pressure itself usually has no symptoms. You can have it for years without knowing it, that's why it's called the "silent killer”. During this time, though, it can damage the heart, blood vessels, kidneys, and other parts of your body. Blood pressure below 120 over 80 mmHg (millimeters of mercury) is considered optimal for adults. A systolic pressure of 120 to 139 mmHg or a diastolic pressure of 80 to 89 mmHg is considered "prehypertension" and needs to be watched carefully. A blood pressure reading of 140 over 90 or higher is considered high. Hypertension is the medical term for high blood pressure. It doesn't mean that you’re tense or nervous. You can be a calm, relaxed person and still have high blood pressure.
      A single high blood pressure reading doesn't mean you have high blood pressure, but it's a sign that you should have further observation. Certain diseases, such as kidney disease, can cause high blood pressure. In 90 to 95 percent of cases, the cause of high blood pressure is unknown. The ancient Greek physician Galen first discovered the existence of blood in the human body. The brain and nerves were responsible for sensation and thought. The blood and arteries filled the body with life-giving energy. He also believed that the liver and veins provided the body with nourishment and growth.
It was not until 1847 that human blood pressure was recorded. However blood pressure could still only be...