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