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Blood pressure is the force exerted by circulating blood against the walls of blood vessels, particularly arteries. It reflects the pressure during two specific phases of the heart's functioning. The systolic pressure is the top number, indicating the pressure in the arteries when the heart beats. Meanwhile, the diastolic pressure is the bottom number, revealing the pressure in the arteries when the heart is at rest between beats.
The unit of measurement for blood pressure is millimeters of mercury (mmHg). For a healthy individual, normal blood pressure is generally defined as systolic pressure less than 120 mmHg and diastolic pressure less than 80 mmHg, often expressed as 120/80 mmHg.