Control blood pressure

To control your blood pressure, your body must adjust how much blood is pumped through your heart. Your body must also adjust the amount of pressure in your blood vessels.

How Your Brain Responds. When your blood pressure begins to fall too low, a signal is sent to your brain. Your brain responds by producing chemicals called neurotransmitters. Certain neurotransmitters, called catecholamines, cause your heart to beat faster and more forcefully and cause your blood vessels to tighten. These actions increase your blood pressure.