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ch. 9 Muscular System: Histology and Physiology Test

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5 Written Questions

5 Matching Questions

  1. Muscle contractions
  2. Sarcoplasm
  3. Passive tension
  4. Isotonic contractions
  5. Actin
  1. a cytoplasm without the myofibrils inside sarcolemma
  2. b Change in length but tension constant. Can be concentric, overcomes opposing resistance and muscle shortens or eccentric, tension maintained but muscle lengthens
  3. c the tension applied to a load when a muscle is stretched but not stimulated
  4. d 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. e thin myofilaments composed to two strands of fibrous actin (F actin made of G actin units), tropomyosin molecules, and troponin molecules

5 Multiple Choice Questions

  1. Body movement, maintenance of posture, production of body heat, communication, constriction of organs and vessels, heart beat
  2. muscle plasma membrane in the area of the junction
  3. Heart
    Single nucleus centrally located
    Striated, involuntary, intercalated disks with gap junctions
  4. small sacs that contain Acetylcholine, a neurotransmitter
  5. Heavier connective tissue surrounding muscle fibers with their endomysium.

5 True/False Questions

  1. Myosinthick myofilaments, many elongated molecules, two heavy myosin molecules to form a rod and two heads, four light myosin chains attached to the heads


  2. Smooth muscle cellsInnervated 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


  3. Sub-threshold stimulusnot strong enough to cause an action potential in any of the axons in a nerve and causes no contraction


  4. Sarcolemmahighly ordered units formed by actin and myosin myofilaments extending from one Z disk to another


  5. EpimysiumThicker, superficial to external lamina, layer of connective tissue outside the sarcolemma


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