Bernoulli's equation, along with the continuity principle, When there is an obstruction, the radius decreases to 0.0020m and the continuity principle with Bernoulli’s equation can be used to see how the pressure of the blood is affected.

= -19595Pa = -147mmHg

Bernoulli’s equation doesn’t work because it gives a negative pressure as a result; as a consequence a vacuum is created. This is because the continuity equation tells us that as area decreases, velocity increases. However, this cannot be applied when blood is involved because it is known that as blood goes through a blocked artery, velocity decreases.