Differentiate systolic pressure to diastolic pressure?

Answer:
Systolic blood pressure occurs when the heart contracts and forces blood out into the vasculature. The pressure in the arterial system is highest at this point. It is the "top number" in a blood pressure reading. i.e. 120/80, systolic is 120.
Diastolic blood pressure is the blood pressure in the arterial vasculature when the heart is at rest. This is when there is the least amount of pressure in the vasculature. It is the "lower number" in a blood pressure reading. i.e. 80 in the above example.
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