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A&p Chapter 10 - Muscular Tissue

15 Questions
AP Quizzes & Trivia

For Anatomy

Questions and Answers
  • 1. 
  • 2. 
    The wasting away of muscle due to lack of use is known as                         while the replacement of skeletal muscle fibers with scar tissue is known as                       .
  • 3. 
    The synaptic end bulbs of somatic motor neurons contain synaptic vesicles filled with the neurotransmitter                             .
  • 4. 
    • A. 

      True

    • B. 

      False

  • 5. 
    The sequence of events resulting in skeletal muscle contraction are: a) generation of a nerve impulse; b) release of the neurotransmitter acetylcholine; c) generation of a muscle action potential; d) release of calcium ions from the sacroplasmic reticulum; e) calcium ion binding to troponin; f) power stroke with actin and myosin binding and release.
    • A. 

      True

    • B. 

      False

  • 6. 
    In muscle physiology, the latent period refers to:
    • A. 

      The period of lost excitability that occurs when two stimuli are applied immediately one after the other

    • B. 

      The brief contraction of a motor unit

    • C. 

      The period of elevated oxygen use after exercise

    • D. 

      An inability of a muscle to contract forcefully after prolonged activity

    • E. 

      A brief delay that occurs between application of a stimulus and the beginning of contraction

  • 7. 
    Which of the following muscle proteins and their descriptions are mismatched?
    • A. 

      Titin: regulatory protein that holds troponin in place

    • B. 

      Myosin: contractile motor protein

    • C. 

      Tropomyosin: regulatory protein that blocks myosin-binding sites

    • D. 

      Actin: contractile protein that contains myosin-binding sites

    • E. 

      Calsequestrin: calcium-binding protein

  • 8. 
    • A. 

      Cross-bridges are formed when the energized myosin head attaches to actin's myosin-binding site

    • B. 

      ATP undergoes hydrolysis

    • C. 

      The thick filaments slide inward toward the M line

    • D. 

      Calcium concentration in the cytosol increases

    • E. 

      The Z discs are drawn toward each other

  • 9. 
    Which of the following is not true concerning sarcomeres (before contraction begins) and muscle fiber length-tension relationships?
    • A. 

      If sarcomeres are stretched, the tension in the fiber decreases

    • B. 

      If a muscle cell is stretched so that there is no overlap of the filaments, no tension is generated

    • C. 

      Extremely compressed sarcomeres result in less muscle tension

    • D. 

      Maximum tension occurs when the zone of overlap between a thick and thin filament extends from the edge of the H zone to one end of a thick filament

    • E. 

      If sarcomeres shorten, the tension in them increases

  • 10. 
    Which of the following are sources of ATP for muscle contraction? 1) creatine phosphate, 2) glycolysis, 3) anaerobic cellular respiration 4) aerobic cellular respiration, 5) acetylcholine
    • A. 

      1,2, and 3

    • B. 

      2,3, and 4

    • C. 

      2,3 and 5

    • D. 

      1,2,3, and 4

    • E. 

      2,3,4, and 5

  • 11. 
    What would happen if ATP were suddenly unavailable after the sarcomere had begun to shorten?
    • A. 

      Nothing, the contraction would proceed normally

    • B. 

      The myosin heads would be unable to detach from actin

    • C. 

      Troponin would bind with the myosin heads

    • D. 

      Actin and myosin filaments would separate completely and be unable to recombine

    • E. 

      The myosin heads would detach completely from actin

  • 12. 
    Match the following:
    • A. a sheath of areolar connective tissue that wraps around individual skeletal muscle fibers
    • A.
    • B. dense irregular connective tissue that separates a muscle into groups of individual muscle fibers
    • B.
    • C. bundles of muscle fibers
    • C.
    • D. the outermost connective tissue layer that encircles an entire skeletal muscle
    • D.
    • E. dense irregular conncetive tissue that lines the body wall and limbs and holds functional muscle units together
    • E.
    • F. a cord of dense regular connective tissue that attaches muscle to the periosteum of bone
    • F.
    • G. muscle cell
    • G.
    • H. areolar and adipose connective tissue that separates muscle from skin
    • H.
    • I. connective tissue elements extended as a broad, flat layer
    • I.
    • J. a two-layer tube of fibrous connective tissue enclosing certain tendons
    • J.
  • 13. 
    Match the following:
    • A. synapse between a motor neuron and a muscle fiber
    • A.
    • B. invaginations of the sarcolemma from the surface toward the center of the muscle fiber
    • B.
    • C. myoblasts that persist in mature skeletal muscle
    • C.
    • D. plasma membrane of a muscle fiber
    • D.
    • E. ozygen-binding protein found only in muscle fibers
    • E.
    • F. Ca2+ storing tubular system similar to smooth endoplasmic reticulum
    • F.
    • G. contracting unit of a skeletal muscle fiber
    • G.
    • H. middle area in the sarcomere where thick and thin filaments are found
    • H.
    • I. area in the sarcomere where only thin filaments are present but thick filaments are not
    • I.
    • J. separates the sarcomeres from each other
    • J.
    • K. area of only thick filaments
    • K.
    • L. cytoplasm of a muscle fiber
    • L.
    • M. composed of supporting proteins holding thick filaments together at the H zone
    • M.
  • 14. 
    Match the following (some answers will have more than one answer):
    • A. has fibers joined by intercalated discs
    • A.
    • B. thick and thin filaments are not arranged as orderly sacromeres
    • B.
    • C. uses satellite cells to repair damaged muscle fibers
    • C.
    • D. striated
    • D.
    • E. contraction begins slowly but lasts for long periods
    • E.
    • F. has an extended contraction due to prolonged calcium delivery from both the sarcoplasmic reticulum and the interstitial fluid
    • F.
    • G. does not exhibit autorhythmicity
    • G.
    • H. uses pericytes to repair damaged muscle fibers
    • H.
    • I. uses troponin as a regulatory protein
    • I.
    • J. can be classified as single-unit or multiunit
    • J.
    • K. can be autorhythmic
    • K.
    • L. uses calmodulin as a regulatory protein
    • L.
  • 15. 
    Match the following:
    • A. the smooth muscle action that allows the fibers to maintain their contractile function even when stretched
    • A.
    • B. a brief contraction of all the muscle fibers in a motor unit of a muscle in response to a single action potential in its motor neuron
    • B.
    • C. sustained contraction of a muscle, with no relaxation between stimuli
    • C.
    • D. larger contractions resulting from stimuli arriving at different times
    • D.
    • E. process of increasing the number of activated motor units
    • E.
    • F. contraction in which the muscle shortens
    • F.
    • G. inability of a muscle to maintain its strength of contration or tension during prolonged activity
    • G.
    • H. sustained, but wavering contraction with partial relaxation between stimuli
    • H.
    • I. produced by the continual involuntary activation of a small number of skeletal muscle motor units; results in firmness in skeletal muscle
    • I.
    • J. contraction in which muscle tension is generated without shortening of the muscle
    • J.
    • K. amount of oxygen needed to restore the body's metablolic conditions back to resting levels after exercise
    • K.
    • L. contraction in which a muscle lengthens
    • L.