Everybody has, and needs blood pressure. Without it, blood cannot circulate through the body. And without circulating blood, vital organs cannot get the oxygen and food that they need to work. So it's important to know the role of blood pressure, and the organs and systems that help regulate it.

The explanation of blood pressure begins with the cardiovascular system, the system responsible for circulating blood through the heart and blood vessels. When the heart beats, a surge of blood is released from the left ventricle, which is the heart's main pumping chamber, into an intricate web of blood vessels that spread throughout the body.

The arteries are the blood vessels that carry nutrients and oxygenated blood from the heart to the body's tissues and organs. The largest artery, aorta, is connected to the left ventricle and serves as

Blood pressure is the measure of the force generated by the heart against the artery walls. This force is expressed as two numbers, such as 110 over 80 mm Hg (millimeters of mercury). The first number, the "systolic" blood pressure, represents the amount of force used by the heart to initially fill the blood vessel circuit; the second number, the "diastolic" blood pressure, is a measure of the resistance to that force. Combined, these numbers give a picture of how hard the heart is working to get blood to the tissues in the body.

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