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Across 1. INITIAL ENERGY SOURCE THAT REGENERATES ATP 3. THIN PROTEIN FILAMENTS 6. FASCIA EXTENDING BEYOND MUSCLE FIBERS, CORDLIKE 8. CHEMICALS CELLS USE TO COMMUNICATE 9. CONTRACTION OF A SINGLE MUSCLE FIBER 12. WHERE A MOTOR NEURON AND A SKELETAL MUSCLE FIBER MEET 14. FIBERS APPEAR AT REST, BUT UNDER DEGREE OF SUSTAINED CONTRACTION 16. BROAD FIBROUS SHEETS OF CONNECTIVE TISSUE 17. ACh - SKELETAL MUSCLE CONTRACTION NEUROTRANSMITTER 18. THREADLIKE STRUCTURES THAT AID IN MUSCLE CONTRACTION 19. SITE OF FUNCTIONAL CONNECTION IN NMJ 20. PIGMENT THAT MAKES SKELETAL MUSCLE REDDISH BROWN

Down 2. SARCOMERES SHORTEN, THICK/THIN FILAMENTS SLIDE 4. REQUIRED STRENGTH TO STIMULATE MUSCLE FIBER 5. COMBINED FORCE OF INDIVIDUAL TWITCHES 7. INCREASE IN NUMBER OF ACTIVATED MOTOR UNITS 10. THICK PROTEIN FILAMENTS 11. CAPABILITY OF CONDUCTION ELECTRICAL IMPULSE 13. CONTROL EFFECTORS 15. DENSE CONNECTIVE TISSUE