Muscle Biology Crossword

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Across
  1. 4. Specialized membrane that encloses each skeletal muscle fiber.
  2. 5. Protein strand that blocks actin's binding sites until calcium arrives.
  3. 8. Increase in muscle fiber size from repeated workload.
  4. 9. Phase when muscle fibers return to resting length after tension stops.
  5. 11. Process in which muscle fibers generate tension and shorten.
  6. 14. Calcium‑binding protein that exposes actin's active sites.
  7. 15. Oxygen‑storing pigment found inside muscle fibers.
Down
  1. 1. Increased muscle tension caused by rapid, repeated stimuli.
  2. 2. Tough connective tissue cord that attaches muscle to bone.
  3. 3. Decline in a muscle's ability to generate force after prolonged activity
  4. 5. Sustained maximal contraction from high‑frequency stimulation.
  5. 6. Alternating light and dark bands visible in skeletal muscle.
  6. 7. Anaerobic pathway producing ATP and lactic acid when oxygen is low.
  7. 10. Decrease in muscle size due to disuse or lack of stimulation.
  8. 12. Protein filament that slides past myosin to shorten a muscle fiber.
  9. 13. Cytoplasm of a muscle cell that stores glycogen, myoglobin, and organelles.