What are three factors that influence blood flow?

Three key factors that influence blood flow are blood pressure, vascular resistance, and blood viscosity. Blood pressure, the force exerted by circulating blood on vessel walls, drives blood flow through the circulatory system. Vascular resistance, affected by the diameter and elasticity of blood vessels, determines how easily blood can move through them. Blood viscosity, or the thickness of blood, also impacts flow rate; higher viscosity can slow down circulation.