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.
Red Blood cells can be low for many reasons. They are produced in response to hypoxia (low amounts of oxygen in the blood), when the hormone erythropoeitin is released from the kidneys. Blood cells are made in the white bone marrow.