NPB 101 Project: Muscular System

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