Blood pressure is the amount of force caused by blood as it pushes through the blood vessels in the body. This pressure is created by the pumping action of the heart. Blood vessels are like small tubes with blood constantly flowing through them. In order for blood to flow to all parts of the body from the heart, there has to be enough force behind the blood for it to be pushed all the way down to our toes and all the way up to our brain. This is our blood pressure.