1. Muscle Intro Functions of muscles
Movement: respiration, circulation, defecation
Stability: resists gravity and provides tension to tendons
Communication
Heat Production: muscle provides 85% of body heat

2. Connective Tissue
Think of connective tissue as the wrapping that holds muscle bundles together and separates them
Endomysium: thin layer that surrounds each muscle cell(fiber) makes room for capillaries and nerve fibers
Fascicles: bundles of muscle cells that appear as grain to the naked eye

3. Connective Tissue
Perimysium: A thick connective layer that surrounds each fascicle.
Epimysium/Deep Fasciae: a layer that surrounds each muscle
Superficial fascia: the layer of connective tissue between the muscle and skin, can be fatty

4. Anatomy of Muscles Origin: a relatively stationary attachment
Belly: thick midregion of muscle
Insertion: a relatively mobile attachment
Fusiform: muscle thick in the middle thin at ends (biceps brachii)
Parallel muscles: straplike muscles uniform with parallel fascicles (sartorius)

5. Anatomy of Muscles
Convergent muscles: Fan-shaped, broad at origin, narrower at insertion
Pennate muscles: feather-shaped, fascicles run obliquely to a tendon that runs the length of muscle
Circular muscle: Sphincters (eyelids, anus)

6. Coordinated Action
Prime mover: muscle that produces most force during movement
Synergist: a muscle that aids the prime mover
Antagonist: muscle that resists the prime mover controlling rate of movement
Fixator: muscle that prevents a bone from moveing, holds steady