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    Muscular System Multiple Choice

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    Detailed not needed, just verifying choice

    1. Which of the following does NOT compress the abdomen ______________. latissimus dorsi
    rectus abdominis
    external oblique
    transversus abdominis
    internal oblique

    2. Paralysis of which of the following would make an individual unable to flex the thigh ______________.
    iliopsoas and rectus femoris
    vastus medialis
    vastus intermedius
    vastus lateralis
    biceps femoris

    3. Which of the following are composed of myosin ______________. thin filaments
    all myofilaments
    thick filaments
    Z lines
    light bands

    4. Which of the following connective tissues surrounds an individual muscle cell ______________.
    sarcolemma
    endomysium
    perimysium
    fascicle
    epimysium

    5. Which of the following groups of terms is placed in order from largest to smallest ______________.
    fascicle, fiber, myofibril, myofilament
    fiber, myofibril, myofilament, fascicle
    myofilament, myofibril, fiber, fascicle
    fascicle, fiber, myofilament, myofibril
    fiber, myofibril, fascicle, myofilament

    6. A muscle located on the dorsal side of the body is the ______________.
    trapezius
    rectus femoris
    pectoralis major
    external intercostals
    rectus abdominis

    7. The mechanical force of contraction is generated by ______________.
    a sliding of thin filaments past thick ones
    the temporary disappearance of thin filaments
    shortening of the thick filaments
    shortening of the thin filaments
    the "accordian-like" folding of thin and thick filaments

    8. Muscle tone is ______________.
    a state of sustained partial muscular contraction that is vital for the health of muscles
    the ability of a muscle to maintain a contraction against an outside force
    the feeling of well-being following exercise
    the condition of atheletes after intensive training
    the result of increased neuromuscular system coordination and increased metaboloc rate

    9. During muscle contraction, myosin cross bridges attach to active sites of ______________.
    Z lines
    actin filaments
    the H zone
    myosin filaments
    thick filaments

    10. The broadest muscle of the back is the latissimus dorsi.
    True
    False

    11. When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length. True
    False

    12. A prime mover of the arm that acts in adduction is the deltoid. True
    False

    13. Plantar flexion at the ankle joint is accomplished by the tibialis anterior muscle.
    True
    False

    14. The effect of the neurotransmitter on the muscle cell membrane is to modify its permeability properties temporarily.
    True
    False

    15. An aponeurosis is a ropelike piece of muscle fascia that forms indirect connections to muscles of the leg.
    True
    False

    16. The sarcoplasmic reticulum is vital to the integrity of muscle contraction.
    True
    False

    17. Oxygen debt refers to the oxygen required to make creatine phosphate.
    True
    False

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    https://brainmass.com/biology/human-anatomy-and-physiology/muscular-system-multiple-choice-106098

    Solution Preview

    1. latissimus dorsi (because it is on the back, not the abdomen)

    2. iliopsoas and rectus femoris (the other muscles listed would extend the knee or the thigh but the illiopsoas is definately involved in flexion of the thigh)

    3. thick filament (actin is the contractile protein of the thin filament)

    4. endomysium ("endo" means inside or innermost, and this is the innermost covering...the sarcolemma is not connective tissue)

    5. fascicle, fiber, myofibril, myofilament (from largest to smallest...each of these is basically a bundle of the next one on the list)

    6. trapezius ...

    Solution Summary

    Various multiple choice questions about muscles are explained.

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