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5 Written Questions

5 Matching Questions

  1. Presynaptic terminal
  2. Synaptic fatigue
  3. Muscle contractions
  4. Postsynaptic membrane or motor end-plate
  5. Incomplete tetanus
  1. a Muscle fibers partially relax between contraction
  2. b response to a stimulus that causes action potential in one or more muscle fibers; lag or latent phase, contraction phase, and relaxation phase. Graded response for whole muscles, strength of contractions range from weak to strong depending on stimulus strength
  3. c each axon terminal
  4. d muscle plasma membrane in the area of the junction
  5. e least common, occurs in neuromuscular junction, due to lack of acetylcholine

5 Multiple Choice Questions

  1. Bundle of muscle fibers ensheathed by perimysium
  2. Occurs in absence of oxygen and results in breakdown of glucose to yield ATP and lactic acid; net gain of 2 ATP from glycolysis; supports intense muscle contraction for up to 3 minutes
  3. During resting conditions stores energy to synthesize ATP; provides enough energy to sustain max contractions for about 8-10 seconds
  4. Actin myofilaments slides over myosin to shorten sarcomeres, actin and myosin do not change length
    Shortening sarcomeres is responsible for skeletal muscle contraction and during relaxation, sarcomeres lengthen
  5. the force applied to an object to be lifted when a muscle contracts

5 True/False Questions

  1. PropagateSpread from one location to another

          

  2. Synaptic cleftspace between the presynaptic terminal and the muscle fiber

          

  3. DepolarizationReturn of resting membrane potential; voltage-gated Na+ channels close and voltage-gated K+ channels open and K+ moves out of the cell making it more negative

          

  4. Trepelarge protein molecule that holds the thick myofilaments in place

          

  5. Sarcoplasmcytoplasm without the myofibrils inside sarcolemma

          

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