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19. Cardiopulmonary bypass Centrifugal pumps have (choose one answers) -varying flow despite constant revolutions - constant flow with constant revolutions 20. Cardiopulmonary bypass What is the main difference between an oxygenator and the native lung (choose one right answer) - the surface area of the oxygenator is much smaller than the native lung - the volume of the native lung is comparable to the oxygenator - the surface area of the native lung is comparable to the oxygenator 21. Cardiopulmonary bypass Explain the function of the pump of the heart lung machine 22. Artificial-biological Interactions Explain why it is required to give the anticoagulant heparin during cardiopulmonary bypass 23. Extracorporeal/mechanical circulatory support Describe the principle of a left ventricular assist device (LVAD) 24. Extracorporeal/mechanical circulatory support Explain the difference between a left ventricular assist device (LVAD) and a total artificial heart (TAH) 25. Extracorporeal/mechanical circulatory support Describe the main two components of an ECMO System