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39

Across 3. These potentials are cyclical depolarizations and depolarizations cause by flux in sodium 5. The fibers that contain slow myosin and high oxidative capacity 6. A complex of three proteins; one attaches, one that binds, and one that contains 7. The other protein that makes up the filaments of the sarcomere 9. the dark stiriation due to the presence of thick filaments 10. Muscle with no voluntary control 11. two intertwined subunits, each with a long tail and protruding head 13. The twitch measured by attaching the bottom end of the muscle to a mobile object 14. The mechanism that drives the sliding of thick and thin filaments past one another 15. long fibrous molecule extended over actin to block myosin-binding sites 20. Fibers that contain fast myosin and have high glycolytic capacity 22. Connects muscles to bones 27. The rod like elements in a muscle cell 29. Connected to at least two bones. 32. The receptors that detect muscle tension 33. A reddish molecule that binds oxygen and stores it to be released when oxygen inside a cell declines 34. The decline in a muscle's ability to maintain constant force 35. The center of the A band that is lighter 36. Muscle fiber's plasma membrane 37. These potentials are slow depolarizations caused by increase in Na, Ca, or decrease in K 38. The type of frequency of muscle where independent twitches peak rises stepwise 39. Saclike membranous network surrounding each myofibril

Down 1. When toxins cause motor neurons to stimulate muscle contractions 2. Mechanical response of an individual muscle cell 4. The delay of a few milliseconds that occurs between action potential and contraction 5. The correlations between the size of a motor unit and the order of recruitment 8. The type of frequency of muscle where an AP arrives before the twitch causing a larger force output 12. connected to the sarcolemma and penetrate into the cell's interior 16. An increase in the number of motor units 17. A motor neuron and all the muscle fibers attached to it 18. Thin filament region with no overlap of thick filaments 19. One of the proteins that make up the filaments of the sarcomere 20. Bundles of individual muscle cells 21. The substance that when bound to causes contraction in smooth muscle 23. The receptors that detect muscle length 24. The fibers that have a high oxidative capacity and fast myosin 25. The enzyme that catalyzes the phosphorylation of myosin crossbridges in smooth muscle 26. Muscle cells 28. The twitch measured by rendering both ends of the muscle immobile 30. A muscle fiber's semifluid cytoplasm 31. Fundamental unit of a myofibril