Across
- 3. The thick filament of a muscle fiber
- 8. The most important ion in muscle contraction
- 9. This muscle tissue type is found in the heart
- 11. The thin filament of a muscle fiber
- 12. Muscle cells are stimulated to contract at the ______ junction.
- 13. Moves Tropomyosin out of the way when calcium ions bind to it
- 14. This muscle tissue type is under voluntary control
- 15. This muscle tissue type is found in most of the internal organs
- 16. Area between the nerve and the muscle is filled with _______ fluid
Down
- 1. Covers the binding sites on actin
- 2. This is the neurotransmitter that causes muscle contraction
- 4. Gap between the axon terminal and the muscle cell
- 5. Stripes visible in muscle tissue
- 6. Basic contractile unit of the muscle cell, makes up myofibrils
- 7. This causes calcium channels to open in muscle contraction
- 10. Main function of the muscular system that requires the help of the skeletal system