Across
- 4. composed of 2 heavy, 4 light polypeptide chains
- 8. basic contractile unit, from Z line to Z line
- 9. the main function of the sarcoplasmic reticulum is to store ___
- 10. during excitation, ___ is released from the vesicles
- 11. bundle of muscle cells (fibers) surrounded by perimysium
- 13. ___ of the T-tubule membrane results in calcium release of the SR
- 15. primary protein in thin filament
- 16. loosely connected to the F-actin strands
- 17. fibers that rely on anaerobic metabolism for energy
- 20. T-tubule and two terminal cisternae are the region of the Z line
Down
- 1. fibers that are fatigue-resistant, good for prolonged exercise
- 2. increase in fiber number
- 3. increase in fiber size
- 5. capacity of skeletal muscle for adaptive change
- 6. lengthening of muscle is a ___ contraction
- 7. skeletal muscle is ___ in appearance
- 12. cytoplasm of muscle cell
- 14. skeletal muscle is composed of 20% ___
- 18. protein attached near one end of each tropomyosin molecule
- 19. skeletal muscle is composed of 75% ___