1 Frontal- one sinus per side, located within the bone of the forehead above the level of the eyes and nasal bridge (figures 1 and 3).  Sphenoid- one sinus per side, located behind the ethmoid sinuses; the sphenoid is not seen in a head-on view but is better appreciated looking at a side view (figure 3).
During upright exercise, the normal blood pressure response is to observe a progressive increase in systolic blood pressure with no change or even a slight decrease in diastolic blood pressure. The slight decrease in diastolic blood pressure is due primarily to the vasodilation of the arteries from the exercise bout.
Blood Flow. Rising carbon dioxide levels and oxygen demands force your heart to contract more frequently, which increases your heart rate during exercise. Blood flow increases as your heart pumps more oxygen and nutrients through your circulatory system's systemic portion. The systemic circulatory system includes blood vessels that deliver oxygen and nutrient-rich blood to tissues throughout your body.