(Is he running away from cohort 7?
or heading fast to a bright and great
future!
Dr.Bill Dailey
University of Pennsylvania
Dept. of Chemistry
When purified, caffeine is an intensely bitter white powder. It is added to colas and other soft drinks to impart a pleasing bitter note. However, caffeine is also an addictive stimulant.
n humans, it stimulates the central nervous system, heart rate, and respiration, has psychotropic (mood altering) properties, and acts as a mild diuretic.
A normal dose of caffeine is generally considered to be 100 mg, which is roughly the amount found in a cup of coffee. However, more than half of all American adults consume more than 300 mg of caffeine every day, which makes it America's most popular drug. Caffeine is generally consumed in coffee, cola, chocolate, and tea, although it is also available over-the-counter as a stimulant.
Caffeine is believed to work by blocking adenosine receptors in the brain and other organs. This reduces the ability of adenosine to bind to the receptors, which would slow down cellular activity. The stimulated nerve cells release the hormone epinephrine (adrenaline), which increases heart rate, blood pressure, and blood flow to muscles, decreases blood flow to the skin and organs, and causes the liver to release glucose. Caffeine also increases levels of the neurotransmitter dopamine.
http://chemistry.about.com/od/moleculescompounds/a/caffeine.htm