Is the force when you heart contracts and relaxes to push blood thought the body. There needs to needs to be a certain level of sure for perfusion to happen so oxygen and carbon dioxide and nutrients and wast to exchange at the capillary level.
Blood pressure is maintained by:
The can maintain Blood Pressure by either increasing or decreasing the number of beats per minute and increase and decrease the force the heart muscle contracts. To increase the blood pressure the control centre can increase the rate and or how hard the heart contracts. To lower blood pressure the heart can slow down the rate and or decrease how hard the heart is contracting.
The vessel in the circulatory system have the ability to dilate to increase the physical space in the circulatory system to decease blood pressure while vessel can constrict to decrease the physical space to increase blood pressure. If a person has had some type of blood loss or dehydrated so the there is less blood volume then needed the circulatory system will decrease the size of the tank by constricting vessels.