Final answer:
Blood flow through a tube is proportional to pressure divided by resistance. According to Poiseuille's law, the flow rate is directly proportional to the pressure difference and inversely proportional to the length of the tube and the viscosity of the fluid.
Step-by-step explanation:
Blood flow through a tube is proportional to pressure divided by resistance. According to Poiseuille's law, the flow rate is directly proportional to the pressure difference and inversely proportional to the length of the tube and the viscosity of the fluid. In simpler terms, if the pressure difference increases, the flow rate will increase, and if the length or viscosity increases, the flow rate will decrease. Additionally, the flow rate increases with the fourth power of the tube radius.