Answer:
Systolic pressure
Step-by-step explanation:
In medicine, the systolic pressure refers to the pressure of the blood when the heart pumps blood out of it (as opposed to the diastolic pressure which refers to the pressure of the blood when the heart is filling itself with blood).
When we measure our pressure, the highest of the two numbers taken (or the first one) is the one that represents the the systolic pressure.
Therefore, The first of the two numbers measured when taking the blood pressure represents the systolic pressure.