Caffeine can be found mainly in seeds, leaves and fruit of
some plants such as coffee beans, guarana, yerba mate, cacao beans, and tea. It
is composed of a soft, odorless, slightly bitter tasting white crystalline
xanthine alkaloid and a stimulant drug. The most common names for caffeine are
3,7-dihydro-1,3,7-trimethyl-1h-purine-2,6-dione and 1,3,7-trimethylxanthine. Many
humans, some 90%, consume more than 300 mg of caffeine every day, making this
drug one of the most popular. This drug functions as a central nervous system
stimulant, which blocks adenosine receptors in the brain and other organs. To a
nerve cell, caffeine appears to look similar to an adenosine that causes
fatigue by slowing down nerve cell activity. Caffeine binds to the adenosine
receptor, but does not slow down the cells activity. It essentially confuses
the nerve cell preventing the cell to not be able to see adenosine anymore
because caffeine is taking up all the receptors adenosine binds to. Caffeine
also has other effects such as increased heart rate, blood pressure, blood flow
to the muscles, along with decreased blood flow to the skin and organs, causing
the liver to excrete glucose. The positive effect of alertness and increased
focus are short-lived usually wearing off in about five hours. Although there
is a strong correlation of dependency to the drug, some studies have shown that
there is an association with a lower overall risk of cancer, specifically
hepatocellular and endometrial cancer.
Helmenstine, A. (n.d.). What is caffeine and how does it work?. Retrieved from http://chemistry.about.com/od/moleculescompounds/a/caffeine.htm
Sand, R. caffeine. Retrieved from http://www.britannica.com/EBchecked/topic/88304/caffeine
Smith, S. W. (n.d.). Retrieved from http://www.chemistryexplained.com/Bo-Ce/Caffeine.html
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