Across
- 1. center of the H zone, consists of proteins that hold the myosin filaments in place
- 4. first phase of cellular respiration, occurs in the cytoplasm
- 7. a network of membranous channels beneath the sarcolemma of a muscle fiber
- 11. a type of respiration that completely breaks down glucose, requires oxygen, and occurs in the mitochondria
- 12. Layers of dense connective tissue that surround and separate each muscle
- 14. these bands are anchored to the Z lines, made up of actin filaments
- 16. extends inward from epimysium, surrounds bundles of skeletal muscle fibers
- 18. the cell membrane of a muscle fiber
- 20. these tubules are invaginations of the sacrolemma
- 24. Broad sheets of connective tissue that can connect muscles to each other
- 25. this pigment stores oxygen in muscle tissue for aerobic respiration
- 26. Layer of connective tissue around each skeletal muscle
- 27. parallel, contained in sarcoplasm, active in muscle contraction
Down
- 2. allows neurons to communicate with the muscle fiber
- 3. the organization of thick and thin filaments produces these bands
- 5. neurotransmitter for skeletal muscle fiber contraction at the neuromuscular junctions
- 6. Fused to the periosteum of bones
- 7. myofibrils are made up of many units of these
- 8. in the sliding model of muscle contraction, this is formed when a myosin head attaches to a binding site on the actin filament
- 9. the enzyme that provides energy from ATP to ADP to the cross-bridges
- 10. the cytoplasm of a muscle cell
- 11. these bands are made up of overlapping thick and thin filaments
- 13. proteins in thick filaments of myofibrils
- 15. this junction is a synapse between a motor nueron and a muscle fiber that it regulates
- 17. proteins in thin filaments of myofibrils
- 19. this carries oxygen to muscle tissue in red blood cells
- 21. these neurons stimulate skeletal muscle fibers to contract
- 22. bundles of skeletal muscle fibers inside perimysium
- 23. zone in center of the A band, consists of myosin filaments only