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.
Although coffee contains water, it causes the body to excrete more water than it actually takes in. The result is a fluid deficit, which, over time, can lead to a variety of health problems, including dry skin, constipation and bladder infections. Coffee can lead to a chronic deficiency of B vitamins. Coffee can cause a buildup of toxins within the body, which increases your need for vitamin C and other antioxidants. Two cups of coffee may contain 30 mg of caffeine. This is enough to raise your blood pressure and pulse rate significantly.