If there is a variation in the measured resistance in the inflow system at the same pressure by {TAIL ~ this method}, this is emerging from expansion of {HEAD ~ the body cavity} 
If there is a variation in the measured resistance in the inflow system at the same pressure by { TAIL ~ this method } , this is emerging from expansion of { HEAD ~ the body cavity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD