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2. Important information about blood pressure and its measurement
2.1 How does high/low blood pressure arise?
Your level of blood pressure is determined in the circulatory center of the
brain and adjusts to a variety of situations through feedback from the ner-
vous system. To adjust blood pressure, the strength and frequency of the
heart (Pulse), as well as the width of circulatory blood vessels is altered.
Blood vessel width is affected by way of fine muscles in the blood vessel
walls. Your level of arterial blood pressure changes periodically during
heart activity. During the "blood ejection" (Systole), the value is highest
(systolic blood pressure value). At the end of the heart’s "rest period"
(Diastole) pressure is lowest (diastolic blood pressure value). Your blood
pressure values must lie within certain normal ranges in order to prevent
particular diseases.
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