You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is If radius of a vessel is doubled then the blood flow is increased by? and explain in detail?
Ans. B 16 timesRef: Ganong: 26th ed. P 563* The influence of lumen diameter on resistance is dramatic. This is because resistance is inversely proportional to the radius of the blood vessel (one-half of the vessels diameter) raised to the fourth power (R=1/r4).* This means, that if an artery or arteriole constricts to one-half of its original radius, the resistance to flow will increase 16 times. And if an artery or arteriole dilates to twice its initial radius, then resistance in the vessel will decrease to 1/16 of its original value and flow will increase 16 times.