Calciferol, One-Alpha (Alfa Calcidol)
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HORMONES: HOW YOUR BODY?S SECRET SYSTEM WORKS
As you walk down the street, a large, ferocious dog suddenly jumps from behind a bush and directly in your path. Your heart begins thumping wildly.
Your blood pressure peaks. Your body mobilizes its energy resources. You are ready to stand firm and do battle or to flee – ready for fight or flight.
Your body contains a marvelous system of glands and nerves that quickly organizes your heart, lungs, liver, kidneys, blood vessels, and bowels, causing them to work at top efficiency in an emergency. And when the threat ends, that same glandular system calms everything down.
Of course, your brain acts first. Through your senses, generally your eyes, the brain recognizes the dog as a threat, sizes up the danger, and then releases chemicals to trigger the complex web of glands posted throughout your body. The glands pour out more chemicals -messengers that start the other organs working at top speed.
These chemical messengers are called hormones (from the Greek hormon, meaning to stimulate). Until 15 years ago, scientists had found only about 20 hormones; now they believe that more than 200 hormones course through our veins and arteries.
“Recently, we have had an explosion in our knowledge of hormones,” says Dr. Charles Hollander, director of endocrinology (the study of glands) at New York University Medical Center. “Through endocrinology, we have new understanding of cancer, diabetes, heart disease, depression, and a host of other diseases.”
The fight-or-flight hormone network takes care of just one of your needs -the survival response to danger. Your glands also release hormones to
? regulate your sexual development (ovaries and testes),
? influence your blood pressure and heart rate (adrenals),
? adjust your growth (pituitary),
? control energy use (thyroid), and
? govern how your cells burn sugar (pancreas).
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