Blood pressure is a measure of the pressure or force of blood against the walls of your blood vessels (arteries). Your blood pressure reading is based on two measures. The top number (systolic) is the measure of the pressure when your heart contracts and pushes blood through the arteries. The bottom (diastolic) number is the measure of the pressure when your heart relaxes between beats.
https://ipsnews.net/business/2020/10/30/blood-pressure-911-reviews-dont-...