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Chapter 9 Reading Quiz Review 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Across Down 3. glucose is broken down to lactic acid when oxygen is not present 6. glucose is broken down using oxygen to make ATP 9. glucose is broken down into pyruvic acid 10. rodlike contractile element 12. extension of sarcolemma that conducts nerve impulses in muscle cells 14. space between axon terminal and the muscle fiber 15. connective tissue sheath around each muscle fiber 16. muscle cell 17. actin and myosin 19. connective tissue surrounding whole muscle 1. smooth ER that regulates levels of Calcium ions in muscle cells 2. muscle attachmentment at movable bone 4. bundle of muscle cells 5. basic contractile unit (composed of myofilaments) 7. striated and voluntary 8. electrical current through a membrane 11. a neurotrasmitter 13. oxygen-binding protein in muscle cells 14. nonstriated and involuntary 18. cell membrane of a muscle cell