The other planets: Mercury was the Roman messenger of the gods. Venus was the Roman goddess of love. Mars was the Roman god of war. Jupiter was another name for Jove, Roman god of the skies and king of the gods. Saturn was the Roman god of time and the harvest, and Jupiter's father.
Pulse pressure is the difference between the systolic and diastolic pressure readings. It is measured in millimeters of mercury (mmHg). It represents the force that the heart generates each time it contracts. If resting blood pressure is (systolic/diastolic) 120/80 millimeters of mercury (mmHg), pulse pressure is 40. pulse pressure is considered abnormally low if it is less than 25% of the systolic value. The most common cause of a low (narrow) pulse pressure is a drop in left ventricular stroke volume.
Confidence votes 86. the systolic blood pressure is the pressure that the contraction of the ventricles have on the arteries, and a low systolic means a low pressure exerted by the ventricles of the heart. A low systolic would be below 90-100 on average but everyone is different.