Therefore, needle valves are used to control flow into delicate human body tissues such as {HEAD ~ blood vessels}, which might be damaged by {TAIL ~ sudden surges} of fluid under pressure 
damaged by
Therefore , needle valves are used to control flow into delicate human body tissues such as { HEAD ~ blood vessels } , which might be damaged by { TAIL ~ sudden surges } of fluid under pressure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH