Unrelated to topic but I was in hospital recently and nurses came around to do vital,blood pressure oxygen temperature.i was having a high blood pressure. Often I lay with crossed legs but a nurse told me to uncross my legs and blood pressure went down. Why why cross legs increase blood pressure ?
Fill a rubber glove with water and tie the opening, now squeeze three of the fingers and observe what happens with the remaining ones
The cardiovascular system is effectively a very long bag of liquid, if you compress one area it can no longer hold the same volume of blood, that blood needs to go somewhere else, which increases the pressure in the other areas