A needle is positioned on the end of the cylinder and discharges liquid through an opening as the plunger forces {HEAD ~ the liquid} to {TAIL ~ the bottom} of the cylinder 
to
A needle is positioned on the end of the cylinder and discharges liquid through an opening as the plunger forces { HEAD ~ the liquid } to { TAIL ~ the bottom } of the cylinder
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH