Final answer:
The brain is responsible for establishing the 'set point' for our blood pressure.
Step-by-step explanation:
The part of the body responsible for establishing the 'set point' for our blood pressure is the brain. Specifically, the cardiovascular centers located in the medulla oblongata regulate blood pressure and flow. These centers monitor changes in blood pressure and respond accordingly. They also sense the levels of oxygen, carbon dioxide, and hydrogen ions in the blood and adjust blood pressure accordingly.