The membrane includes {HEAD ~ a bellows portion} for increasing {TAIL ~ the distance} by which the membrane can be deflected in response to the given pressure increase 
The membrane includes { HEAD ~ a bellows portion } for increasing { TAIL ~ the distance } by which the membrane can be deflected in response to the given pressure increase
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH