Neuron Structure. Your brain is made of approximately 100 billion nerve cells, called neurons. Neurons have the amazing ability to gather and transmit electrochemical signals -- think of them like the gates and wires in a computer.
Most doctors will only consider chronically low blood pressure as dangerous if it causes noticeable signs and symptoms, such as: 1  Dizziness or lightheadedness. 2  Nausea. 3  Fainting (syncope)  Dehydration and unusual 1  thirst. Dehydration can sometimes cause blood pressure to drop.  Lack of 1  concentration. Blurred vision.  Cold, clammy, pale skin.
For example, erythropoietin production will go up when moving to a high altitude. This is because the air pressure is lower, the pressure of oxygen is lower and so less oxygen is taken up by the blood therefore stimulating erythropoietin production. In low oxygen states people risk developing hypoxia-oxygen deprivation.