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> A bit about blood pressure Part 1
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A bit about blood pressure Part 1 (Teacher: Michael)
"I think I've got blood pressure, doctor."
Whenever I get given this statement - and it is more often than you would think - I am sorely tempted to give
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following reply: "Thank goodness you have, you'd be dead if you hadn't got blood pressure!"
What my patient is really trying to say is: "I think I've got
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higher than normal blood pressure."
A certain pressure is required to propel blood all over
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body which, for
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average adult, contains over 96,000 km of blood vessels. Without blood circulating through
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body, cells in
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brain, kidneys and muscles die rapidly.
Blood pressure varies not only from day to day, but also from hour to hour. It also changes with posture; being lower when lying down than when sitting or standing up.
This is why old people feel giddy through lack of blood to
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brain when they get up in
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morning. It is also why you sometimes feel faint and giddy when you bend down to tie shoelaces and then straighten up.
Running for
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bus or playing squash will cause your blood pressure to rise from physical exertion.
But there are emotional factors too: fear that you are going to be late,
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stress of
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exam, interview or driving test.
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