The Poiseuille ’s works under restricted conditions: 1. Steady laminar flow 2. Newtonian fluids 3. Rigid cylindrical tubes
The largest R is in individual capillaries and lowest R in aorta and vanae cavae
If the pressure difference between two points is 1 mm Hg and the flow is 1 ml/sec, the resistance is said to be 1 peripheral resistance unit, usually abbreviated PRU.
The reasons: 1. Increases the force that pushes blood 2. Distends the vessels at the same time The reasons: 1. Increases the force that pushes blood 2. Distends the vessels at the same time