Feb7 14

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AUGUSTA

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FREE T AKE-H OME C OPY!

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HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS • HEALTH • MEDICINE • WELLNESS

AUGUSTA’S MOST SALUBRIOUS NEWSPAPER • FOUNDED IN 2006

FEBRUARY 7, 2014

I heart heart Doesn’t everybody? But could you pass a pop quiz on the basics of lub-dub? Perhaps not. But that will change in the next few minutes.

Cardiac Function in Seven Easy Steps Here’s everything you need to know to, if not become a heart surgeon, at least to understand what’s going on inside your chest at this precise moment. • 1. Oxygen-depleted blood returns from its latest trip through the body, entering (upper left in the diagram) the superior vena cava. Blood goes through it into the heart’s right atrium. • 2. From there it goes through the tricuspid valve down into the right ventricle. When the ventricle contracts, it forces the blood out through the pulmonary valve. • 3. As blood is pumped out of the right ventricle and through the pulmonary valve it enters the pulmonary artery and a separate pulmonary circuit where the lungs (#4, not shown) almost instantaneously exchange carbon dioxide for oxygen. • 5. Freshly oxygenated blood reenters the heart into the left atrium, kind of a staging area for the left ventricle. • 6. Mitral valves release the oxygenated blood into the powerful left ventricle. • 7. From there it is pumped (or dubbed, as in the dub of lub dub) up into the aorta and off to points throughout the body, near and far. Repeat. Elapsed time for all of this: about 0.8 seconds. The valves are all one-way, permitting blood flow in one direction only (unless something disastrous happens). The valves and the heart’s four chambers all operate (in a healthy heart) in precise coordination, although not simultaneously: at exactly the moment one valve opens, another will close; when one chamber contracts, another will wait about a tenth of a second before it contracts. It’s one amazing piece of machinery. +

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• Amazing heart facts • Practical tips to avoid heartbreak

Heart diagram credit: Greetings from Toronto

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(706) 364.1163 • WWW.SCRUBSOFEVANS.COM • 4158 WASHINGTON RD • ACROSS FROM CLUB CAR • M-F: 10-6:30; SAT: 10-4


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Feb7 14 by Daniel Pearson - Issuu