Blood Pressure Levels!!!?

Question

What do the two levels in the blood pressure indicate? and what are the units of pressure for it???
any clue!!!!
please give me exact information!!!!
cheers...
sam!!!

Answer 1

Two levels are called "systolic" and "diastolic". Units are millimeters of mercury.
Systolic pressure is the pressure with which left ventricle of heart pumps blood into the system.
Diastolic is the pressure in the left ventricle at the beginning of diasole ie when the total contraction of left ventricle is over and when left ventricle is receiving blood from left atrium.

Answer 2

Blood pressure is the pressure exerted by the blood at right angles to the walls of the blood vessels. Unless indicated otherwise, blood pressure refers to systemic arterial blood pressure, i.e., the pressure in the large arteries delivering blood to body parts other than the lungs, such as the brachial artery (in the arm). The pressure of the blood in other vessels is lower than the arterial pressure. Blood pressure values are universally stated in millimetres of mercury (mmHg). The systolic pressure is defined as the peak pressure in the arteries during the cardiac cycle; the diastolic pressure is the lowest pressure (at the resting phase of the cardiac cycle). The mean arterial pressure and pulse pressure are other important quantities.

Typical values for a resting, healthy adult human are approximately 120 mmHg systolic and 80 mmHg diastolic (written as 120/80 mmHg), with large individual variations. These measures of blood pressure are not static, but undergo natural variations from one heartbeat to another or throughout the day (in a circadian rhythm); they also change in response to stress, nutritional factors, drugs, or disease.