physio ex 33b 9.0 act 6

i am having a bit of trouble answering the following questions for activity six on cardiovascular dymaitc  could some one please help me with these 

5. What do you think might happen to the pressure in the pump during the filling if the right flow tune becomes leaky and allowed back flow into the pump?

6  apply this concept to the human heart, what might occur in the left heart pulmonary blood vessels if the aortic valve becomes leaky and allows back flow of blood ?

7. If the aortic valve became constricted , what must the heart do in order to deliver the same amount of blood per minute ?