{HEAD ~ Fluid flow} is directed to the second chamber during cardiac diastole and away from {TAIL ~ the second chamber} during cardiac systole, causing the device to function in a counterpulsation mode 
is directed away from
{ HEAD ~ Fluid flow } is directed to the second chamber during cardiac diastole and away from { TAIL ~ the second chamber } during cardiac systole , causing the device to function in a counterpulsation mode
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH