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this anatomy is kicking my ass. i have done this quiz but want to double check if I ma right before I submit it.

TEST A MUSCLE CELLS 1-100 Do every 4th 1. Diameter of a muscle fiber is about: A. 1/10 of a hair’s B. 1/10 mm C. 1/10 micron D. 10 microns 2. Myosin: A. uses ATP B. is the greatest protein weight of a hotdog C. has heads and tails D. all of these 3. ATP is always used: A. just before powerstroke B. just after power stroke C. once a crossbridge has formed 4. ATP carries energy in the form of: A. phosphates B. electrons C. protons D. Calcium ions 5. Myosin pulls directly on: A. actin B. troponin C. tropomyosin D. other myosins 6. When relaxed, the length of a myosin molecule becomes: A. longer B. shorter 7. The thin filaments are NOT: A. actin B. the lighter striations C. always in contact with thick filaments D. I Bands 8. Actin chains pull on: A. Z-discs B. myosin heads C. other actin chains 9. Fibers are made mostly of fibrils, which are made of sarcomeres, which are made mainly of filaments. A. T B. F 10. The function of tropomyosin is to prevent muscle contraction. A. T B. F 11. The function of troponin is to allow muscle contraction IF it detects that a nerve signal must have arrived. A. T B. F 12. Spreads the nerve signal deeper into the cell: A. Terminal tubules B. ATP-driven pumps C. axons D. none of these 13. Calcium ion pumps are located here: A. tubules B. cisterns C. sarcolemmas D. Z-discs 14. Rigor mortis does not requires one last burst of ATP binding after death. A. T B. F 15. Percent of a fiber that is sarcomeres and fibrils: A. 80 B. 60 C. 40 D. 20 16. Most ATP for use by the diaphragm is made here: A. IMM B. OMM C. ICM D. OMG E. cytoplasm 17. Lots of myoglobin: A. Type I B. Type II 18. Glucose compound is main fuel: A. Type I B. Type II 19. Faster-moving myosin: A. Type I B. Type II - 20. Your dog’s tail is likeliest: A. Type I B. Type II 21. Fiber microtrauma triggers fiber hypertrophy and glycogen deposition equally in all muscle cells. A. T B. F 22. The perimysiums form the muscle’s tendon which itself merges with the periosteum and then bone matrix. A. T B. F 23. Long term space travel causes: A. muscle hypertrophy B. osteoporosis C. microtrauma D. all or none of these 24. Most accurately describes a myofibril: A. a thick filament B. a sack full of fibrils C. a very long line of sarcomeres D. filaments of collagen 25. Striations: A. stripes running shortways across a cell B. in voluntary, smooth, and heart muscles C. primarily actin and tropomyosin D. all of the above 26. Glycogen: A. structure that metabolizes molecules for energy B. molecule that stores glucose C. molecule that stores oxygen D. structure that stores red blood cells 27. True: A. myosin pulls on actin B. actin pulls on Z’s C. troponin pulls on tropomyosin D. all or none of these 28. The part of myosin that touches actin is called: A. a troponin B. a thick filament C. a cross-bridge D. a head 29. What is used to extend the myosin heads? A. ATP B. calcium ions C. sodium ions D. relaxing 30. Muscle cell shortening consists of: A. actin beads pull on the myosin heads until they flip outwards B. myosin heads wiggle actin beads into spaces in the thick filament C. troponin wraps tropomyosin around and around the thin filaments D. none of the above is true 31. Untrue after rigor mortis: A. muscle fibers are all contracted B. no more ATP is being made C. Ca ++ runs around loose in the cell D. myosin heads lose touch with actins 32. Muscle hypertrophy consists of more: A. sarcomeres per myofibril B. myofibrils per fiber C. fibers per muscle D. all of the above 33. The only way to bulk up a muscle is to: A. feed it lots of protein before or after exercise B. keep it aerobic during exercise C. keep it anaerobic during exercise D. injure it with exercise 34. Type I fibers do NOT have lots of: A. contraction speed B. oil droplets C. myoglobin D. mitochondria 35. Type II fibers: A. are fatigue-resistant B. have best blood supply C. are in your throwing muscles D. none of these 36. Duck breast meat is red because: A. it has a lot of oxygen- storage protein in it B. this is an emergency muscle for a duck C. has a lot of clear oil in it D. it is very slow twitch 37. An average suburban runner will have in their calves: A. equal mix of types I and II B. predominantly Type II fibers C. mostly Type I fibers D. a lot more sarcomeres than average 38. How much faster is fast-twitch than slow-twitch? A. 25 X B. 6 X C. 10 X D. 3X
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39. Which most accurately describes a fiber? A. a thick filament B. a line of sarcomeres C. a sack full of myofibrils D. filaments of collagen 40. Which is the least common protein inside a muscle cell? A. collagen B. troponin C. actin D. myosin 41. True of striations: A. stripes running lengthwise down a cell B. found only in voluntary muscles C. made primarily of actin and myosin D. made of thick filaments but not thin filaments 42. Where is a T-tubule? A. around each sarcomere B. through the outer cell membrane C. next to the calcium depots D. all of these 43. What are mitochondria? A. structures that make ATP B. a synonym for sarcomere C. waste products of muscle contraction D. some other answer 44. Which is longest? A. the red stripe/striation inside a muscle cell B. sarcomere C. thin filament D. myofibril 45. Myoglobin is used to: A. store red blood cells B. make energy C. store oxygen D. store glucose 46. Which protein has the most active movement? A. actin B. myosin C. troponin D. titin 47. What is the major part of a cross-bridge? A. actin B. myosin C. tropomyosin D. troponin 48. Which protein lies in a spiral alongside the actin? A. myosin B. troponin C. tropomyosin D. myoglobin 49. What is the function of calcium in a muscle cell? A. an intracellular trigger of contraction B. binds to troponin C. leads to exposure of spots on each actin subunit D. all of the above 50. When does ATP “cock” the myosin heads? A. immediately before each contraction B. during each contraction C. immediately after each contraction D. it depends 51. By what % does a fully contracted muscle shrink? A. 50% B. 30% C. 90% D. 70% 52. Rigor mortis occurs because: A. muscle fibers decompose B. ATP runs around loose in the cell C. Ca ++ runs around loose in the cell D. all of the above 53. True of Type I fibers: A. fast twitch B. store starch C. red D. power muscles 54. True of Type I fibers: A. fatigue-resistant B. in postural muscles C. good blood supply D. all of the above 55. Chicken breast has to be “white meat” category because: A. this is an emergency muscle for a chicken B. it has a lot of oxygen-storage protein in it C. it has a lot of clear oil in it D. all of the above 56. A talented sprinter would have in her thighs: A. more endurance due to oil droplets B. much more Type I C. much more Type II D. equal mix of types I and II 57. How does a slow twitch fiber make its ATP? A. it just pulls it out of its many capillaries B. aerobically out of oil droplets with its many mitochondria C. anaerobically out of glycogen via its many mitochondria D. glucose molecules for energy to push a phosphate onto ADP 58. Which usually has much more slow-twitch than fast-twitch in humans? A. biceps B. longissimus C. triceps D. psoas 59. There are several proteins present in the I band. A. T B. F 60. Actin and Myosin in relaxed muscle always overlap at least a little. A. T B. F 61. Which two are capable of changing their shape? A. actin and myosin B. myosin and troponin C. troponin and tropomyosin D. actin and tropomyosin 62. If you suddenly lost your tropomyosin you would: A. have full-body muscular contractions always B. be unable to move a muscle at all C. be not that different from right now D. be a type of Superman in strength 63. Which changes most in shape during contractions? A. myosin B. actin C. troponin D. tropomyosin 64. A neuron’s tip does not touch the next cell. A. T B. F 65. The “Off” and “On” switches for muscle cell contraction are, respectively: A. cross-bridges and heads B. tropomyosin and troponin C. troponin and calcium D. ACh and Ca ++ 66. Your un-moving myosin heads are all right now: A. touching actins B. curled up C. stretched out D. all or none of these 67. If you injected a lot of ATP into a person dead one minute, then gave CPR to spread the blood around, that would relieve rigor mortis for a while. A. Yes of course B. No of course not 68. Mashed-up fresh raw steak mush, stirred up in water, with ATP then added, will contract some. A. yes B. no
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