Distinguish between exocrine and endocrine glands. (p. 101)

Synergists – muscles that assist the prime mover, often by steadying a movement, preventing unwanted movements, and helping the prime mover move more efficiently. 4. Antagonists – muscle(s) that must relax (lengthen) while the prime mover contracts (shortens). Antagonists are often on the opposite side of the body part. 5. The roles of these muscles can change based on the kind of movement desired. 6. Example includes: biceps and triceps muscles. III. Skeletal Muscle Tissue Microscopic structure