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5 Written questions

5 Matching questions

  1. Isometric contractions
  2. Rigor mortis
  3. Fascia
  4. Sliding-filament model
  5. Resting membrane potential
  1. a Development of rigid muscles several hours after death; caused from a stop of ATP production
  2. b No change in length but tension increases (Postural muscles of body)
  3. c Membrane voltage difference across membranes (polarized)
    Inside cell more negative and more K+
    Outside cell more positive and more Na+
    Must exist for action potential to occur
  4. d General term for the connective tissue sheets within the body
  5. e 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 Multiple choice questions

  1. thick myofilaments, many elongated molecules, two heavy myosin molecules to form a rod and two heads, four light myosin chains attached to the heads
  2. Mechanism where an action potential causes muscle fiber contraction, involves sarcolemma, transverse or T tubules, terminal cisternae, sarcoplasmic reticulum, Ca2+, and troponin
  3. Bundle of muscle fibers ensheathed by perimysium
  4. Superficial to the epimysium, separates and compartmentalizes individual muscles or groups of muscles
  5. inside plasma membrane becomes less negative; when the cell is stimulated, gated Na+ channels open and Na+ diffuses into the cell

5 True/False questions

  1. AcetylcholinesteraseA degrading enzyme in synaptic cleft, breaks down the Ach

          

  2. Synaptic cleftsmall sacs that contain Acetylcholine, a neurotransmitter

          

  3. Myofibrilthreadlike structure that extends from one end of the muscle fiber to another

          

  4. Fatigue in musclesAttached to bones
    About 40% of the body weight
    Nuclei multiple and peripherally located
    Striated, Voluntary and involuntary (reflexes)

          

  5. Complete tetanusMuscle fibers partially relax between contraction