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5 Written questions

5 Matching questions

  1. Smooth muscle regulation
  2. Sarcomeres
  3. Endomysium
  4. Passive tension
  5. Acetylcholinesterase
  1. a the tension applied to a load when a muscle is stretched but not stimulated
  2. b A degrading enzyme in synaptic cleft, breaks down the Ach
  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 highly ordered units formed by actin and myosin myofilaments extending from one Z disk to another
  5. e Thicker, superficial to external lamina, layer of connective tissue outside the sarcolemma

5 Multiple choice questions

  1. Heart
    Single nucleus centrally located
    Striated, involuntary, intercalated disks with gap junctions
  2. No change in length but tension increases (Postural muscles of body)
  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. 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. Return 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

5 True/False questions

  1. Cross-bridgesthreadlike structure that extends from one end of the muscle fiber to another


  2. Fatigue in musclesFound only in heart, Striated, Each cell usually has one nucleus, Has intercalated disks and gap junctions, Specific area acts as Pacemaker, Autorhythmic cells, Action potentials of longer duration and longer refractory period, Ca2+ regulates contraction


  3. Active tensionthe tension applied to a load when a muscle is stretched but not stimulated


  4. Slow-twitch or high-oxidative (Type I) fibersContraction of equal force in response to each action potential


  5. FasciculusGeneral term for the connective tissue sheets within the body