Pulse wave velocity (PWV) is a measure of arterial stiffness.he study of the basic scientific principles of the velocity of the pulse wave through the arterial tree dates back to 1808 with the work of Thomas Young.
Put simply, chain migration is a derogatory term used to describe the ability of U.S. citizens and green card holders to bring their extended family into the country. A majority of the roughly one million foreigners who are allowed to enter the U.S. to become permanent residents each year are approved because they're related to Americans.
Best Answer: Emigration is the act and the phenomenon of leaving one's native country to settle in another country. It is the same as immigration but from the perspective of the country of origin. Immigration is the movement of people from one nation-state to another.While human migration has existed throughout human history, immigration implies long-term permanent residence (and often eventual citizenship) by the immigrants: tourists and short-term visitors are not considered immigrants.mmigration is the movement of people from one nation-state to another. While human migration has existed throughout human history, immigration implies long-term permanent residence (and often eventual citizenship) by the immigrants: tourists and short-term visitors are not considered immigrants.