> You would think that something like blood pressure would be highly regulated in the body Counterpoint: a 6' (1.83 m) tall column of blood has a pressure of 1

> You would think that something like blood pressure would be highly regulated in the body Counterpoint: a 6' (1.83 m) tall column of blood has a pressure of 142 mmHg at the bottom- higher than your normal blood pressure. When you change posture from prone to sitting to standing, your blood pressure is basically swinging 100%. Hell, the diastolic blood pressure at your feet is almost double what your arms are at. Plus, the oxygen consumption of various body parts is hugely variable. More oxygen requires more blood and more blood requires more pressure. With that kind of variance all over your body it's not a shock that it's also generally pretty variable.