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when pressure in the sphygmomanometer falls below systolic pressure, blood can again enter the artery. At first, blood enters only at peak systolic pressure, and the sound of blood pulsing through the artery becomes audible through the stethoscope. As the pressure falls further, the sound changes because the vessel is remaining open for longer periods. When the cuff pressure falls below diastolic pressure, blood flow becomes continuous, and the sound of the pulse becomes muffled or disappears completely.
Blood pressure naturally rises with age but certain factors cause it to be higher than normal:
- smoking/drinking
- lack of exercise
- stress
- salty diet
- obesity
- family history
If you mean what causes the systolic to be high while the diastolic is normal or low the answer is hardening of the arteries. Normally as the pulse of blood comes through the artery the walls stretch to accommodate the wave of blood. As the arteries get stiffer instead of stretching they just cause the pressure to go up.
If yo are asking what causes high blood pressure then the answer is that we usually do not know. Age, salt intake, weight and lack of activity all contribute. Things like pain , anxiety and stimulants cal also make it go up. Occasionally there is a diagnosable and treatable medical condition that can be reversed but this is the exception.
It is the pressure of the blood against the walls of the arteries.
xD o(-.-)o
hope i was able to help
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Blood pressure
