2. Once you recognize that this is a single replacement problem, determine whether the non-bonded element is a cation or anion. Then determine which element it will replace. Remember cations can only replace cations and anions can only replace anions.
If you haven't eaten for several hours and your blood sugar level drops, another hormone from your pancreas called glucagon signals your liver to break down the stored glycogen and release glucose back into your bloodstream.
Describing Low Levels of Blood Cells. 1  A low level of red blood cells is referred to as anemia. 2  A low level of white blood cells is referred to as leukopenia (you may hear of neutropenia, which refers to a low level of the particular type of white blood cells known as neutrophils.)