What is an active site and what is its relationship to an enzyme? an active site in an enzyme is the area that breaks the bond in its substrate. E.g. a maltose molecule's glycocide bond is broken by the active site in a maltase enzyme.
The caffeine in a cup of coffee might help your small blood vessels work better. Credit: Â© jogyx / Fotolia. The caffeine in a cup of coffee might help your small blood vessels work better, according to research presented at the American Heart Association's Scientific Sessions 2013.
Blood flow measured in a subjectâs finger increased by 30 percent over a 75-minute period compared to those whose coffee was â no joke â secretly switched with the decaffeinated version. Those measurements provide a good indication of the workings of the inner lining of the bodyâs smaller blood vessels, researchers say.