Stages of Muscle Fiber Activity

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Across
  1. 2. (7&8) increased + charges in cell reach sarcoplasmic reticulum and triggers release of ______
  2. 5. (4) + charged ions enter into cell and raise the cell's ________________
  3. 8. (2) neurotransmitter crosses synaptic cleft and binds to receptor located on the _____ of the muscle fiber
  4. 12. (9) Calcium in cytoplasm of cell can now bind to this regulatory protein
  5. 13. (10) This regulatory protein moves off of the thin filaments
Down
  1. 1. (16) phase of activity that occurs when calcium reabsorbed back into SR, Ach release stops, and thin and thick filaments let go of one another
  2. 3. (1) neurotransmitter released from neuron
  3. 4. (5&6) type of gated channel that opens as a result of increased + charges present in cell
  4. 6. (3) ion that enters cell through the Ach Receptor
  5. 7. (15) thick filaments release thin filaments when ATP binds, resulting in the ______ stroke
  6. 9. (12) Thick filaments, made up of __________, bind to thin filaments
  7. 10. (11) In order to get in proper position for contraction, this energy molecule is used by thick filaments
  8. 11. (13&14) thin filaments are pulled towards center of sarcomere during the _______ stroke