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5 Written questions

5 Matching questions

  1. Atrophy
  2. Sarcomere
  3. Postsynaptic membrane or motor end-plate
  4. Synaptic fatigue
  5. Sub-threshold stimulus
  1. a Decreases in muscle size
  2. b the structural and functional unit of skeletal muscle that extends from one Z-disk to another
  3. c least common, occurs in neuromuscular junction, due to lack of acetylcholine
  4. d muscle plasma membrane in the area of the junction
  5. e not strong enough to cause an action potential in any of the axons in a nerve and causes no contraction

5 Multiple choice questions

  1. A whole muscle contracts with a small or large force depending on number of motor units stimulated to contract
  2. most common type, depends on emotional state of individual
  3. depolarization, repolarizaion
  4. Contract more slowly, smaller in diameter, better blood supply, more mitochondria, myoglobin, more fatigue-resistant than fast-twitch
  5. External lamina

5 True/False questions

  1. Fast-twitch or low-oxidative (Type IIa & Type IIb)Respond rapidly to nervous stimulation, contain a form of myosin to break down ATP more rapidly, less blood supply, fewer and smaller mitochondria than slow-twitch


  2. Distribution of fast-twitch and slow twitchMechanism where an action potential causes muscle fiber contraction, involves sarcolemma, transverse or T tubules, terminal cisternae, sarcoplasmic reticulum, Ca2+, and troponin


  3. Fatigue in musclesdecreased capacity to do work and reduced efficiency of performance


  4. Muscular fatigueSuperficial to the epimysium, separates and compartmentalizes individual muscles or groups of muscles


  5. Titinthin myofilaments composed to two strands of fibrous actin (F actin made of G actin units), tropomyosin molecules, and troponin molecules


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