It is a perfect, four-chambered pump, sending blood pulsing, pulsing, pulsing through the lungs, where it is infused with oxygen, then pumping it out to the organs and tissues of the body.
A body can survive without a kidney or a colon or a lung. But not without a heart. If our heartbeat stops, so do we, organ by organ. After one minute, we pass out. Then we seize. For every minute without a heartbeat, our chances of survival drop by 10 percent. At 10 minutes, brain death.
Electrical impulses within the heart control how often it beats. The number of times it beats each minute depends on age, activity level and health.
The heart of an 11-year-old girl beats between 60 and 105 times a minute.
Though the heartbeat feels like a single thump when you press your fingertips to your wrist, it sounds like a spongy lub-dub through a doctor's stethoscope, as electrical impulses open and shut the upper and lower valves.
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Flir Systems Inc. is expected to develop up to 700 handheld imagers for U.S. Special Operations forces, according to the U.S. Department of Defense. The contract, which was commissioned by the Naval Surface Warfare Center Crane, based in Crane, Ind., is scheduled to be completed by September 2012.
Flir specializes in thermal imaging and broadcast camera systems for surveillance, airborne broadcasting and search and rescue government operations. The company was founded in 1978 and is headquartered in Portland, Ore., with a Flir development site located in Billerica. In 2005, the company reported revenue of $508.6 million.
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