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5 Written questions

5 Matching questions

  1. Muscular fascia
  2. Propagate
  3. Multiple-Wave summation
  4. Cardiac muscle
  5. Sarcomeres
  1. a Superficial to the epimysium, separates and compartmentalizes individual muscles or groups of muscles
  2. b As frequency of action potentials increase, frequency of contraction increases, and therefore muscle tension increases.
  3. c Heart
    Single nucleus centrally located
    Striated, involuntary, intercalated disks with gap junctions
  4. d highly ordered units formed by actin and myosin myofilaments extending from one Z disk to another
  5. e Spread from one location to another

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. Not 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. 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
  4. Like camera flash system, either it reaches threshold and depolarizes or it doesn't.
  5. Myofilaments 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

5 True/False questions

  1. Threshold stimulusnot strong enough to cause an action potential in any of the axons in a nerve and causes no contraction


  2. SarcolemmaMuscle fiber (cell) plasma membrane


  3. Cardiac musclethe structural and functional unit of skeletal muscle that extends from one Z-disk to another


  4. Functions of muscular systemBody movement, maintenance of posture, production of body heat, communication, constriction of organs and vessels, heart beat


  5. Rigor mortislarge protein molecule that holds the thick myofilaments in place


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