Factors affecting resistance. D pressure resistance 3. Poiseuille's Law for laminar flow through a tube. Major resistance vessels are the arterioles . The most important factor in the regulation of blood pressure is the diameter of the arterioles .
Organs can autoregulate their own blood supply.
Heart and skeletal muscle are especially proficient at this. Controlled by sympathetic n.s. No significant parasympathetic effect. B. Capillary network is diffuse . C. Thin walls .