Muscle physiology terminology

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Across
  1. 2. A plateau phase of muscle contraction
  2. 6. Region of sarcomere composed of thin filaments
  3. 7. unit A motor neuron and all of the fibres it innervates (2 words)
  4. 8. Found in thick filaments in muscle fibres
  5. 9. Muscle contraction with no change in length
  6. 10. Adding together of twitches that occur when a muscle is stimulated at high frequency
  7. 11. Basic repeating units that make up myofibrils
  8. 14. Immediate high-energy molecule in muscle (2 words)
  9. 18. principle The relationship between the size of motor units and the order of recruitment (2 words)
  10. 19. reticulum Organelle in muscle fibres that stores calcium (2 words)
  11. 22. Mechanical response of a muscle to a single action potential
  12. 23. Type of muscle fibre with high myosin ATPase activity (2 words)
  13. 26. An oxygen-binding protein found in some muscle fibres
  14. 27. Lengthening muscle contraction
  15. 28. period Time between a stimulus and a response (2 words)
  16. 29. Type of filaments composed of myosin
  17. 30. Protein that binds calcium and initiate the crossbridge cycle
  18. 32. Shortening muscle contraction
  19. 33. An increase in the number of active neurons
  20. 35. Decrease in muscle's ability to produce force
Down
  1. 1. Rodlike elements that contain a muscle's contractile machinery
  2. 3. tubule Structure that transmits action potentials from the sarcolemma into the cell's interior (2 words)
  3. 4. oxidative Type of muscle cells that are used in endurance exercise (2 words)
  4. 5. Plasma membrane of muscle fibres
  5. 6. Twitch during which a muscle shortens and lifts a constant load
  6. 12. Part of thick filaments responsible for producing motion that causes muscle contraction
  7. 13. Mechanism that drives muscle contraction (2 words)
  8. 15. Process of muscle contraction whereby thick and thin filaments move past each other (2 words)
  9. 16. Region of sarcomere with no overlapping filaments
  10. 17. Protein that blocks myosin-binding sites on thin filaments
  11. 18. muscle Type of muscle that is connected to bone (2 words)
  12. 20. Type of muscle fibre with high myoglobin content (2 words)
  13. 21. Bundles of muscle fibres
  14. 24. Region of sarcomere composed of thick filaments
  15. 25. muscle Type of muscle found in internal organs
  16. 31. Found in thin filaments in muscle fibres
  17. 34. Type of filaments composed of actin