Muscle Contraction & Anatomy Crossword

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Across
  1. 1. The connection point where a motor neuron meets a muscle fiber.
  2. 4. When a muscle shortens to create movement.
  3. 7. The thin connective tissue surrounding each muscle fiber.
  4. 8. A nerve cell that sends signals from the brain to muscles to cause movement.
  5. 9. The center line of a sarcomere.
  6. 10. Strong connective tissue that attaches muscle to bone.
  7. 11. The connection formed when a myosin head binds to actin.
  8. 13. The connective tissue surrounding each fascicle.
  9. 15. The energy molecule that powers muscle contraction.
  10. 16. The explanation of how muscles contract by actin and myosin sliding past each other.
  11. 20. A mineral released inside the muscle cell that allows myosin to bind to actin.
  12. 22. A bundle of muscle fibers grouped together inside a muscle.
  13. 23. The pulling motion of the myosin head that shortens the sarcomere.
  14. 24. The outer layer of connective tissue surrounding the entire muscle.
  15. 25. The smallest functional unit of a muscle where contraction happens.
Down
  1. 2. Stiffening of muscles after death due to lack of ATP.
  2. 3. Two muscles that work opposite each other to move a joint.
  3. 5. The thin protein filament that myosin pulls during contraction.
  4. 6. Muscle attached to bones that helps you move voluntarily.
  5. 12. A chemical messenger released by a nerve that tells a muscle to contract.
  6. 14. The striped appearance of skeletal muscle caused by repeating sarcomeres.
  7. 17. The thick protein filament with heads that bind to and pull actin.
  8. 18. The boundary at each end of a sarcomere.
  9. 19. Fiber A single muscle cell that is long and cylindrical with multiple nuclei.
  10. 21. Rod-like structures inside a muscle fiber that contain the parts needed for contraction.