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5 Written questions

5 Matching questions

  1. Propagate
  2. Sumaximal stimuli
  3. Smooth muscle regulation
  4. Muscle contractions
  5. Depolarization
  1. a produces action potentials in axons of additional motor units
  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 Innervated by autonomic nervous system, neurotransmitters are acetylcholine and norepinephrine, hormones important are epinephrine, and oxytocin, receptors present on plasma membrane determines which neurotransmitters or hormones bind and determines response
  4. d Spread from one location to another
  5. e 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

5 Multiple choice questions

  1. Attached to bones
    About 40% of the body weight
    Nuclei multiple and peripherally located
    Striated, Voluntary and involuntary (reflexes)
  2. General term for the connective tissue sheets within the body
  3. small sacs that contain Acetylcholine, a neurotransmitter
  4. 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. Muscle fiber (cell) plasma membrane

5 True/False questions

  1. Excitation-contraction couplingChange in length but tension constant. Can be concentric, overcomes opposing resistance and muscle shortens or eccentric, tension maintained but muscle lengthens


  2. ATPprovides immediate energy for muscle contractions from 3 sources; creatine phosphate, anaerobic respiration, and aerobic respiration


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


  4. Fast-twitch or low-oxidative (Type IIa & Type IIb)Tends to contract in response to sudden stretch but not to slow increase in length, exhibit relatively constant tension or smooth muscle tone, amplitude of contraction remains constant although muscle length varies, does not respond in a all or nothing fashion to action potentials, contracts without major change in the membrane potential


  5. AtrophyGraded response in a muscle. Occurs in muscle that has rested for prolonged period. Each subsequent contraction is stronger than previous until all equal after few stimuli