The body is an amazing and complicated system. Every time a persons heart beats, blood is released from the heart and spread throughout the body via the blood vessels (arteries, capillaries and veins are types of blood vessels). Oxygen is retrieved from the lungs and deposited throughout the body via the blood vessels. Carbon dioxide is carried to the heart via the blood vessels and is sent to the lungs so the carbon dioxide can be released and a new supply of oxygen can be picked up.
Nutrients are also carried throughout the body via the blood vessels. Waste products travel through the blood vessels and, as they travel through the kidneys and liver, the waste products are left behind. The average person has 11 pints of blood traveling through the vessels in their body. To keep the blood moving and all the necessary processes working correctly, some pressure is needed.
Blood pressure measures the amount of pressure in the arteries. A device called a sphygmomanometer (the inflatable arm cuff with the attached air pump and pressure gauge that we are probably familiar with) is used to measure the pressure.
There are two different numbers that make up a...
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