KINS 1223 Study Guide - Midterm Guide: Rubber Band, Occipital Bone, Baseball Bat
3 Feb 2018
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Agonist -produces most of the force a particular joint action (prime mover) Antagonist -muscle the opposes the prime mover; sometimes relaxes agonist to give it. The elbow prime mover is the brachialis complete control over an action, but other times it maintains tension over a joint to prevent injury. Synergist - aids the prime mover in movement; prevents unwanted movement; stablizes joint; modifies direction of movement. Levers enhance speed and power of limb movements. Always a resistance force, fulcrum and effort. Lever rigid bar in the body are the bones and the axis or fulcrum are the joints. Effort arm=portion of the lever from the fulcrum to the point of effort. Resistance/moment arm=fulcrum to the point of resistance. Function of a lever is to produce a gain in the speed distance or force of a motion. Speed or distance cannot happen at the same time. Ex. moving a heavy object with a crow bar.
