Friday, April 23, 2010

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Skin is your largest organ. It covers your body surface (about 2 square meters), varies in thickness from about 0.5 to 3.0 mm, and has a normal temperature range of 32 to 36 degrees Celcius. It is thicker on the dorsal and extensor (the back of the body) than on the ventral and flexor (the front of the body) aspects of the body. It is thinner in infancy and in old age. The skin provides a waterproof and protective covering for the network of muscles, bones, nerves, blood vessels in your body, contains sensory nerve endings, and aids in the regulation of temperature. Our eyelids have the thinnest skin and the soles of our feet the thickest.

Skin Anatomy

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The body is an interconnected and a highly intricate network of trillions of cells.  One of the many functions of cells is to produce energy for life. For each cell to produce energy, it needs fuel primarily in the form of glucose.  The surface of each cell contains docking stations for insulin and glucose.  Insulin serves as the "key" which opens cell receptors for glucose to enter.

There are other transport vehicles inside the cell called Glucose transporters (Glut).  These transport vehicles carry glucose molecules to the mitochondria (the cell's "furnace") where the body ultimately uses it to create energy.

How Problems Begin
As carbohydrates or sugars are absorbed by the intestines after a meal and blood sugar increases, insulin is secreted by the pancreas and circulated throughout the body.  As insulin binds to cell receptors, cells absorb glucose from the blood stream to produce energy and lower blood sugar levels.  As blood sugar decreases, the pancreas secretes glycagon which breaks down glycogen in the liver and releases additional glucose into the blood.

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The heart and blood vessels and also blood itself comprise your cardiovascular system.  Blood moving from heart delivers oxygen and nutrients to every part of the body.  On the return trip, the blood picks up waste products so that your body can get rid of them.

Your heart is a muscle about the size of a clenched fist.  It contracts and relaxes about 70 times a minute at rest (more if you are exercising), beats about 30,000,000 times a year, and pumps about 4,000 gallons of blood daily through its chambers to all parts of the body.  Your blood travels through a rubbery collection of big and small vessels.  If strung together end to end, they can stretch 60,000 miles (enough to circle the globe 2 1/2 times)!

As you inhale, air is sent down to your lungs.  Blood is pumped from the heart through the pulmonary artery to your lungs where carbon dioxide is removed from it and oxygen is mixed in with it.  The oxygenated blood is carried back to the heart through the pulmonary vein.  The arteries carry blood away from your heart under high pressure to smaller and smaller branched tubes called capillaries.  This delivers oxygen to all the cells in your body including bones, skin, and all organs.  Veins bring oxygen-depleted blood back to the heart.

Your blood is mostly comprised of a colorless liquid called plasma.  Red blood cells (which give blood its red appearance) deliver oxygen to cells and carry back waste gases in exchange.  White blood cells attack and kill germs and Platelets cells help your body repair itself after injury.

Your cardiovascular system is a beautiful symphony which sustains your life.  Often it is taken for granted and little is done to ensure its long-term performance.  Lack of preventive care will transform your cardiovascular system into a time bomb.

Cardiovascular Disorders
In 2004, cardiovascular diseases claimed 869,724 lives in the United States (36.3% of all deaths).  148,000 lives belonged to Americans under 65.  According to 2005 estimates from the American Heart Association, 80,700,000 people in the United States have one or more forms of cardiovascular disease:

1) High Blood Pressure - 73,000,000
High blood pressure puts added force against the artery walls which overtime damages the arteries making them more vulnerable to the narrowing and plaque build up associated with atherosclerosis.

2) Coronary Heart Disease (caused by atherosclerosis, the narrowing of the coronary arteries due to fatty buildups of plaque which blocks the flow of blood to heart muscle thus depriving the heart of oxygen.  It is likely to cause Chest Pain and / or Heart Attack) - 16,000,000

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