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Across 1. Cleft where the acetylcholine drops down to connect to a muscle fiber 3. The heads of these connect to the actin to contract a muscle 7. Rigid bar that moves on a fixed point 9. Bony Junctions 10. Respiration that occurs in the mitochondria 16. Besides agonists and antagonists, most movements involve the action of these 18. Cytoplasmic calcium-binding protein 20. Muscles that oppose, or reverse a particular movement 21. Is used to move a resistance or load

Down 2. A muscle that provides the major force for providing a specific movement 4. Flattened fibrous sacs lined with synovial membrane 5. Moving a limb away from the midline 6. Where the most complex joint is found 8. The type of muscle tissue that is found in the stomache and the urinary bladder 9. Supinate forearm 11. Moves toward the origin when the muscle contracts 12. Plasma membrane 13. When a bone is forced out of alignment 14. Immovable joints 15. Peg-in-socket joint 17. The ability of a muscle fiber to recoil and resume its resting length after being stretched 19. Cuff that encircles the shoulder joint and bends with the articular capsule