The control means includes means for monitoring the operation of the heart and for actuating the valves to regulate fluid flow to {TAIL ~ the second chamber} in {HEAD ~ accordance} with same 
The control means includes means for monitoring the operation of the heart and for actuating the valves to regulate fluid flow to { TAIL ~ the second chamber } in { HEAD ~ accordance } with same
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH