Muscular System

Edit Answers
12345678910111213141516171819202122
Across
  1. 3. theory that explains how muscle contractions work; sliding ______ theory
  2. 5. used to describe muscles that are striped in appearance
  3. 8. individual units that join end to end in a myofibril
  4. 10. overlapping patterns of actin and myosin; I and A _____
  5. 12. bundles of muscle fibers
  6. 13. neurotransmitter used to cause muscle contractions
  7. 16. store neurotransmitters
  8. 17. connects muscles to bones
  9. 19. this element bonds to actin, changing its shape
  10. 20. organelle that provides energy needed for muscle contractions
  11. 21. minimum level of stimulus to cause a muscle contraction
  12. 22. this superhero has huge muscles when he's angry
Down
  1. 1. connective tissue that separates individual muscles
  2. 2. type of muscle found in the digestive tract
  3. 4. when muscles relax they (lengthen / shorten)
  4. 5. type of muscle that connects to bone
  5. 6. thin filament of muscle fiber; found in bundles
  6. 7. occurs when muscles become tired
  7. 9. "connection" between neurons and muscle fibers
  8. 11. cell membrane in a synapse that is very folded
  9. 14. type of muscle that makes up the heart
  10. 15. found at the beginning and end of a sarcomere
  11. 17. energy molecule; ATP (adenosine _________)
  12. 18. location where the nervous system meets the muscular system