Now, this describes the diagram only for our systemic cardiovascular system. The pulmonary circulation looks very similar except the pressure within our pulmonary artery is smaller than the pressure within our order which is this one right here. Now, the way that we actually measure blood pressure inside our body is by first calculating our blood pressure within our aorter. This blood vessel right here, the largest artery during cystille. Cystily is the point when our left ventricle actually contracts and creates that hydrostatic pressure. So as soon as the left ventricle contracts, it creates that pressure within our order, and that is cystily.