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.
Iron Deficiency. Iron deficiency is a leading cause of low red blood cell count among Americans. The bone marrow requires iron to produce red blood cells. When the body's iron stores fall to abnormally low levels, red blood cell production slows and anemia ensues.