Blood pressure is recorded using two values: • The first value, known as systolic blood pressure, denotes the pressure exerted on the walls of your arteries during a heartbeat. • The second value, referred to as diastolic blood pressure, signifies the pressure in your arteries between heartbeats when the heart is at rest. • If the blood pressure reading shows a systolic value of 120 and a diastolic value of 80, it is expressed as '120 over 80' or '120/80 mmHg' in writing.