Physioex 33b Cardiovascular Dynamics

Please, I need help. Anyone have the answers to the pump mechanics section of the review sheets?
15. What happened to the rate (Stroke/min) as the right vessel radius was increased?

19. How did decresing the left flow tube radius affect pump chamber filling time?

20. When the left beaker pressure was decreased to 10mm Hg, what happened to the filling time?

21.  With the right flow tube radius decresed to 2.5mm, what conditions did u change to bring the flow rate back to normal?

22.  A decresed tube radius is analogous to atherosclerosis.  describe what effect this would have on resistance in the arterial system and how the human heart might compensate for this change