plural snack bars. snack bar. noun. plural snack bars. Learner's definition of SNACK BAR. [count] : a public place where small meals and snacks are served usually at a counter. There's a snack bar at the pool where we can get nachos.
All muscles exert their force by pulling between at least two points of attachment. The movement that results from contraction is called the action of the muscle. Typically, one attachment remains stationary and is called the origin and the other attachment moves and is called the insertion. Almost all muscles cross at least one joint (moveable connection between two bones) and cause an action across that joint.
ACTIONS: The best way to learn about muscles is to group them into their actions. In this section, choose from over 37 body actions, and see an animation of the action, with a visual list of muscles that perform that action, plus comments in each section. 3D MODELS: There are seven 3D models, each model allows you to control a body area in 3-D space, with multiple stops along the way that identifying the structures and give comments on each area.