The valves regulate fluid flow to the second chamber in {HEAD ~ accordance} with {TAIL ~ electrical signals} from the heart 
with
The valves regulate fluid flow to the second chamber in { HEAD ~ accordance } with { TAIL ~ electrical signals } from the heart
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH