Based on what you know about the flow of urine from the kidneys, choose the statement that best describes what would happen if you were to stand on your head? a. the urine would flow backwards out of the urethra and into the kidneys. b. the urine would flow down to the bladder and then out the urethra. c. the urine would remain in the bladder because there are valves to prevent backflow. d. the urine would remain in the kidneys because the bladder would no longer be able to eliminate any urine.