Artery is constricted as a result of accumulated plaque on
its inner walls.
䡦 To maintain a constant flow rate, the blood must travel
faster than normal through the constriction.
䡦 If the speed is high, the blood pressure in the constriction is
low, and the artery may collapse under external pressure,
causing a momentarily interruption in blood flow. There is
no Bernoulli’s effect during the collapse.
䡦 The blood vessel reopens again under the arterial
pressure and the whole process repeats itself.