When the heart contracts, the blood pressure increases. As the blood flows through the body's system, the pressure gets lower. This is because the heart is relaxing at this point.
So what is systolic pressure? Simply, it is "the pressure when the heart contracts".
And diastolic pressure is "the pressure when the heart relaxes".
You will most likey asked to define these in an exam, so make sure you are aware of their meanings before you progress to the next card.
You may also be asked to write what blood pressure is actually measured in. You will need to know both ways of saying it. These are; mmHg, or mm of mercury.
When someone takes your blood pressure, they will give you two numbers. The top one represents the systolic, and the bottom one represents the diastolic. If you can't remember which is which in an exam, just remember that the systolic is the higher pressure, and is therefore ALWAYS the bigger number. The systolic pressure shouldn't be higher than 135 in a healthy person, and the diastolic 85.
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