In a person standing up, the gauge pressure of the blood at the heart is 110 mm of mercury…

Step 1. Feet. $1060\ \text{kg/m}^3 \times 9.8\ \text{m/s}^2 \times 1.3\ \text{m} = 13\,500\ \text{Pa} = 101\ \text{mm}$ of mercury, so $110\ \text{mm} + 101\ \text{mm} = 211\ \text{mm}$.

Step 2. Head. $1060\ \text{kg/m}^3 \times 9.8\ \text{m/s}^2 \times 0.45\ \text{m} = 4675\ \text{Pa} = 35\ \text{mm}$, so $110\ \text{mm} - 35\ \text{mm} = 75\ \text{mm}$.