The Muscular System: Histology and Physiology

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Across
  1. 2. Joins cardiac muscle cells together
  2. 5. Results from an increase in the size of each muscle fiber
  3. 6. Ability of muscle to spring back to its original resting length after being stretched or extended
  4. 8. Joins some visceral smooth muscles together
  5. 10. Responsible for keeping the back and lower limbs straight, the head upright, and the abdomen flat.
  6. 13. Model that describes he primary function of skeletal muscle fibers is to generate force by contracting, or shortening
  7. 14. the membrane potential at which voltage-gated Na+ channels open
  8. 19. Thick filaments
  9. 20. Passageway for nerves and blood vessels for each muscle fiber
  10. 23. Occurs when the excitable cell is stimulated
  11. 28. Attach muscles to bones
  12. 30. Specialized nerve cells responsible for stimulating skeletal muscle contraction
  13. 31. Ability of a muscle to be stretched beyond its normal resting length and still be able to contract
  14. 33. Muscles contract but cannot relax
Down
  1. 1. Subdivides each whole muscle into numerous, visible muscle fiber bundles
  2. 3. Comprises 40% of body weight
  3. 4. The mechanical component of muscle contraction
  4. 7. Ability of muscles to shorten forcefully
  5. 9. Capacity of skeletal muscles to respond to an electrical stimulus
  6. 11. Without this muscle fibers would be worked to the point of structural damage to them and their supportive tissues
  7. 12. When this is no longer released at the neuromuscular junction, muscle relaxation occurs
  8. 15. Plasma membrane of muscle fibers
  9. 16. Muscle fiber bundles
  10. 17. A muscle cell
  11. 18. Autorhythmic and responsible for the pumping of blood
  12. 21. Transfers one phosphate from one ADP to a second ADP
  13. 22. Thin filaments
  14. 24. A muscle cannot contract until the it moves to uncover the active sites.
  15. 25. Bundles of protein filaments extending through the entire length of the muscle fiber.
  16. 26. Membrane channels that open and close in response to a specific membrane potential
  17. 27. The response of a muscle fiber to a single action potential along its motor neuron
  18. 29. Precursor cells to skeletal muscle fibers
  19. 32. Painful, spastic contractions of skeletal muscle