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