Learning Objectives

By the end of this section, you will be able to:

• Compare and contrast agonist and antagonist muscles

• Describe how fascicles are arranged within a skeletal muscle

• Explain the major events of a skeletal muscle contraction within a muscle in generating force

The moveable end of the muscle that attaches to the bone being pulled is called the muscle’s insertion, and the end of the muscle attached to a fixed (stabilized) bone is called the origin.​

​Interactions of Skeletal Muscles in the Body

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​Although a number of muscles may be involved in an action, the principal muscle involved is called the prime mover, or agonist.

​A synergist can also be a fixator that stabilizes the bone that is the attachment for the prime mover’s origin.

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Classwork​

• Muscle Shapes foldable

• Muscle poster continuation​