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5 Written questions

5 Matching questions

  1. Sliding-filament model
  2. Motor units
  3. Excitation-contraction coupling
  4. Synaptic cleft
  5. Depolarization
  1. a Mechanism where an action potential causes muscle fiber contraction, involves sarcolemma, transverse or T tubules, terminal cisternae, sarcoplasmic reticulum, Ca2+, and troponin
  2. b inside plasma membrane becomes less negative; when the cell is stimulated, gated Na+ channels open and Na+ diffuses into the cell
  3. c single motor neuron and all the muscle fibers innervated
  4. d 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. e space between the presynaptic terminal and the muscle fiber

5 Multiple choice questions

  1. occurs in sheets and found in the urinary, reproductive, and digestive tracts. Characterized by having many gap junctions that pass action potentials from one cell to another causing the sheet to contract as a unit. It is usually autorhythmic, but some contracts only when stimulated.
  2. A degrading enzyme in synaptic cleft, breaks down the Ach
  3. Muscle fibers partially relax between contraction
  4. small sacs that contain Acetylcholine, a neurotransmitter
  5. occurs as sheets as in the walls of blood vessels, small bundles as in the arrector pili and iris of the eye, or as single cells like in the capsule of the spleen. Has fewer gap junctions and the cells or cell groups act as independent units. Normally contract upon stimulation by nerves or hormones.

5 True/False questions

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


  2. Functional properities of smooth muscleNot striated, single nucleus, fewer actin and myosin organized as loose bundles. Dense bodies in cytoplasm and dense areas in plasma membrane, instead of Z disks as in skeletal muscle, have noncontractile intermediate filaments, sarcoplasmic reticulum without transverse tubules, Ca2+ required to initiate contractions and bind to calmodulin


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


  4. 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


  5. Sub-threshold stimulusMyofilaments attach to dense bodies & dense areas, Sarcoplasmic reticulum not well developed and no transverse tubules, Shallow invaginations, caveolae, occur at intervals along the plasma membrane


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