Across
- 2. occurs when another action potential comes before muscle can relax
- 4. myosin head becomes energized in _______ position after ATP is cleaved by ATPase
- 5. _______ Summation: increase in the number of motor units recruited
- 6. enzymatic breakdown of carbohydrates
- 9. muscle contraction occurs by a ___ _____ mechanism
- 12. ________ Response: when exposed to a threshold stimulus, a muscle fiber contracts completely or not at all
- 13. binding of new ATP causes _______ of the myosin head
- 14. when frequency reaches a critical level, the successive contractions become so rapid that the muscle cannot relax
- 15. myosin head binds with _____; low energy configuration
- 17. responsible for 95% of the energy used for contraction
- 19. a single contraction and relaxation cycle produced by an action potential
- 20. Phosphate and ADP are released after myosin head binds and the _______ is formed
- 21. enzyme that phosphorylates creatine
Down
- 1. Myosin-binding sites are found on the _________
- 3. optimal rate of cross bridges formed; produces maximal tension
- 7. the length at which maximal force can be achieved
- 8. produced from AAs in the liver and phosphorylated in the muscle
- 10. myosin-binding sites are inhibited or physically covered by the _________ complex
- 11. ______ summation: increase in the rate of repetition of contraction
- 16. _______ must bind to troponin to expose the myosin-binding sites
- 18. myosin head bends toward center of sarcomere and actin slides toward the M line