Across
- 2. protein component of the thick myofilaments
- 4. when they connect thick filaments and thin filaments, the myosin heads are called _____
- 6. bundles of muscle fibers
- 7. the tropomyosin strands are held in position by molecules of _____
- 8. the area containing thick filaments
- 9. surrounds each skeletal muscle fiber and ties adjacent muscle fibers together
- 10. a layer of of collagen fibers that separates the muscle from surrounding tissues and organs
- 11. openings scattered across the surface of the sarcolemma lead into a network of narrow tubules called _____
- 14. where myofilaments are organized into repeating functional units
- 17. made up of proteins that connect the central portions of each thick filament to its neighbors
- 18. the boundaries of each sarcomere
- 19. cylindrical structures
Down
- 1. nerve fibers
- 2. protein filaments consisting primarily of the proteins actin and myosin
- 3. electrical impulse in the sarcolemma
- 5. a chemical released by a neuron to communicate with other cells
- 12. a narrow space that separates the synaptic terminal from the sarcolemma
- 13. divides the skeletal muscle into bundles of muscle fibers
- 15. the cell membrane of a muscle fiber that surrounds the cytoplasm
- 16. the collagen fibers of all three layers come together to form either a bundle known as a ______