A&P I, Chapter 10. Muscle Tissue

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Across
  1. 2. protein that makes up most of the thin myofilaments in a sarcomere muscle fiber
  2. 3. regulatory protein that covers myosin-binding sites to prevent actin from binding to myosin
  3. 6. cell structure that anchors the ends of cardiac muscle fibers to allow contraction to occur
  4. 7. plasma membrane of a skeletal muscle fiber
  5. 10. oxidative intermediate muscle fiber that is between slow oxidative and fast glycolytic fibers
  6. 13. signaling chemical released by nerve terminals that bind to and activate receptors on target cells
  7. 14. part of the sarcolemma that connects cardiac tissue, and contains gap junctions and desmosomes
Down
  1. 1. glycolytic muscle fiber that primarily uses anaerobic glycolysis
  2. 2. broad, tendon-like sheet of connective tissue that attaches a skeletal muscle to another skeletal muscle or to a bone
  3. 4. increase in the number of motor units involved in contraction
  4. 5. action of myosin pulling actin inward (toward the M line)
  5. 8. projection of the sarcolemma into the interior of the cell
  6. 9. regulatory protein that facilitates contraction in smooth muscles
  7. 11. bundle of muscle fibers within a skeletal muscle
  8. 12. long, cylindrical organelle that runs parallel within the muscle fiber and contains the sarcomeres
  9. 15. regulatory protein that binds to actin, tropomyosin, and calcium