A+-+effects+of+caffeine


 * Q&A WEDNESDAYS **
 * LUCY LI **

Every time you drink tea, coffee, cocoa, chocolate, or soft drinks such as cola you are giving your body a small dose of 1,3,7-trimethylxanthine, commonly known as caffeine. However, if you drink more than the recommended 300 mg/d for adults, caffeine may be affecting you more than you expect. > - amount ingested > - gender > - height/weight > - absorbed by the stomach/small intestines into portal blood > - removed from the body by enzymes in the liver (some of the caffeine) > - broken down by N-acetyltransferase 2 in the liver into several metabolites > - catalysed by NAT2 in acetylation: the transfer of acetate from acetyl-coenzyme > A (AcCoA) to a caffeine intermediate derived from 1, 7-dimethylxanthine, > producing 5-acetylamino-6-formylamino-1-methyluracil (AFMU) > - dissolved into the plasma water as a free drug via systemic circulation (some) > - distributed throughout the body > - excreted in urine > - caffeine is an inhibitor of the adenosine receptor > - caffeine is structured similar to adenosine > - continued stimulation of neurons and excitement of the central nervous system > - results in decreased fatigue, and increased attentiveness > - caffeine is an antioxidant > - prevent heart diseases (300 mg/d) > - increases heart rate, blood circulation, respiratory rate, and metabolic rate > - increases the excretion of calcium > - increases level of fatty acids in blood > - increases stomach acid produced > - irritates the stomach lining > - relaxes the muscles of intestinal system: less effective digestion > - dehydration > - increases urination > - caffeine nerves: shaking hands, palpitations, and wobbliness in legs > - improve physical endurance Next time you decide to drink coffee, or even a can of soda, be careful. Although one cup wouldn't hurt. (1998).// How caffeine affects your body, mind and emotions. //Retrieved October 11, 2010, from [] (2010). // It's your health - caffeine. //Retrieved October 11, 2010, from [] (2009). // 10 important caffeine side effects that people do not think about. //Retrieved October 11, 2010, from [|http://www.testcountry.org/10-important-caffeine-side-effects-that people-do-not-think-about.htm] (2009). // Caffeine. // Retrieved October 11, 2010, from []
 * HOW DOES CAFFEINE AFFECT THE BODY? **
 * known for stimulant (wake-up) effect
 * level of effectiveness depends on various factors:
 * when caffeine is consumed, it is:
 * stimulates the nervous system:
 * stimulates the cardiovascular system
 * other effects (when consumed more then the moderate use):