Which medical term means an abnormal increase in the forward curvature of the lower or lumbar spine? - 4684768
The molecular structure of caffeine. Caffeine belongs to the family of heterocyclic compounds known as purines. It has the systematic name 3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione; it is also known as 1,3,7-trimethylxanthine, and 1,3,7-trimethyl-2,6-dioxopurine.
Originally called theine, caffeine was first discovered in tea in 1827. It was later shown that the theine of tea was identical with the caffeine of coffee, and the term theine was then dropped. While the caffeine in tea and coffee are, technically, identical, the experience is different due to three key factors: