The muscular system is responsible for the movement of the human body. Attached to the bones of the skeletal system are about 700 named muscles that make up roughly half of a personâs body weight. Each of these muscles is a discrete organ constructed of skeletal muscle tissue, blood vessels, tendons, and nerves.elated to the function of movement is the muscular systemâs second function: the maintenance of posture and body position. Muscles often contract to hold the body still or in a particular position rather than to cause movement.
Derry is a borough in Westmoreland County in the Commonwealth of Pennsylvania, 45 miles (72 km) east of Pittsburgh. The Borough of Derry, consisting of the town area, should not be confused with Derry Township, which is a separate municipality surrounding the borough.
Donegal was part of Chester County until 1729, when Lancaster County was taken out of Chester County. During the late 1600s and early 1700s this entire area was virgin frontier territory administered from Philadelphia as part of the Proprietary given to William Penn on March 4, 1681 by King Charles II.