Systolic and Diastolic Pressure
Systolic and Diastolic Pressure is the two-number reading that shows how hard blood pushes when the heart beats and rests.
Explaining systolic and diastolic pressure by grade level
Your heart squeezes to push blood out. That push makes the top number on a blood pressure test. Then your heart rests for a quick pause. That rest makes the bottom number, and both tell how hard blood flows.