This was not a smooth process. The rise of executive power sometimes hurt important interests and always rubbed against the republican sensibilities that Americans inherited from the founders. From time to time, Congress reaped political benefits from thwarting the president. But today Congress reacts rather than leads.
1 Dehydration can sometimes cause blood pressure to drop. 2  However, dehydration does not automatically signal low blood pressure. 3  Fever, vomiting, severe diarrhea, overuse of diuretics and strenuous exercise can all lead to dehydration, a potentially serious condition in which your body loses more water than you take in.
Low Blood Pressure and the Heart. The heart is a muscle that works as a pump and is controlled by electrical signals. Problems with either the pump or the electricity can cause problems with low blood pressure. 1  If the heart beats too quickly, blood pressure may fall because there isn't enough time for the heart to refill in between each beat (diastole).