I am taking Physics and Anatomy simultaneously and was confused by something that was taught and seemed contradictory. In Bernoulli's equation (for fluids) I learned that as the cross sectional area of a pipe or tube decreases, the velocity of the fluid increases. And I also learned that the pressure that a fluid exerts on the walls of the tube is inversely proportional to the velocity (PV = constant). In Anatomy, when the blood pressure of a patient was high, he/she was given drugs which dilated their blood vessels. Dilating the blood vessel (increasing cross sectional area), according to Bernoulli's equation, would decrease the velocity of the blood. And if the velocity falls, shouldn't pressure INCREASE due to them being inversely proportional??