Across
- 3. ___ reticulum; similar to smoother ER in other cells; contain terminal cisternae
- 8. darker region where thick and thin filaments overlap; contain H-Zone and M-Line
- 9. the ability to respond to stimulus from the nervous system
- 10. long proteins found in muscle fibers; actin, myosin, titin; formed of filaments
- 11. areolar CT that wraps individual fibers; electrical insulation, capillary support
- 13. muscles that move body, maintain posture, regulate process, and produce heat
- 15. lighter appearing regions with only thin filaments; get smaller during contraction
- 16. myofilaments arranged in repeating units; overlapping thick and thin filaments
- 17. dense, irregular CT that wraps around the whole muscle
- 19. cytoplasm of muscle fibers; contains lots of mitochondria and contractile proteins
- 21. contractile protein groups; thick - bundles of myosin; thin - twisted strands of actin
- 23. stores oxygen for aerobic ATP; stores glycogen; creatine phosphate can quickly donate phosphate for ATP
Down
- 1. ___ Tubles (T-tubules); structures etched into cell that contains calcium pumps
- 2. muscle fibers contain multiple ___; they have fused myoblasts
- 4. dense, irregular CT that wraps around fascicles; houses blood vessels and nerves
- 5. bundles of muscle fibers held together by CT
- 6. terminal ___; bound sacks that serve as reservoirs for calcium ions
- 7. region with only thick filaments; disappears during contraction
- 12. dense protein discs that delimit the sarcomere
- 13. plasma membrane of muscle fiber; use voltage gated ion channels for electrical signals
- 14. the long, thin muscle cells; each muscle is its own organ
- 18. median of sarcomere
- 20. layers of CT superficial to epimysium that separates individual muscles and binds muscles of similar function together; deep and superficial
- 22. mechanism of moving ions across membranes, especially calcium ions; ion ___