Across
- 1. Thick filament that uses ATP to cause muscle contractions
- 3. If the amount of ATP available and level of Ca2+ is high then muscle _________ continues
- 8. Thin filament that contains troponin and tropomyosin to regulate muscle contraction
- 13. When muscle fiber is stimulated so rapidly that the muscle has no chance to relax
- 15. Motor neurons and skeletal muscle fibers are chemically linked at ____________ junctions
- 17. Binding of this neurotransmitter causes for Na2+ channels to open during neuromuscular junction
- 18. Most common type of muscle in humans
- 19. During muscle contraction the sarcomere length becomes _______
- 20. Type of muscle that is unstriated and involved in involuntary movement
- 23. Light area within the middle of the A band where actin does not reach
- 24. Enzyme that breaks down the neurotransmitter ACh at the synaptic cleft
- 25. Location of where myosin attaches
Down
- 2. Functional and smallest unit of skeletal muscle that is needed for contraction
- 4. During the ________ phase of the cross-bridge cycle myosin attaches to actin
- 5. Caused when the muscle is no longer able to maintain tension and leads to feelings of exhaustion
- 6. Ion that triggers ACh to be released by exocytosis
- 7. When the muscle _______ it uses myosin ATPase more than the Ca2+ pump
- 9. How many different muscle types are there?
- 10. If the amount of motor units ________ then the muscle will contract
- 11. Type of muscle that is striated and involved in involuntary movement
- 12. Elongated muscle fibers held together by connective tissue
- 14. When the muscle _________ it uses the Ca2+ pump of the sarcoplasmic reticulum more than myosin
- 16. Purpose is to allow for muscle contraction and allow muscle to be stretchy so it does not tear
- 21. Binding to ______ causes the beginning of muscle contraction
- 22. Type of muscle that is striated and involved in voluntary movement