Muscle system

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  1. When a smooth muscle is extended (within physiological limits),
    A. no action potential is generated
    B. no option is correct
    C. its membrane is depolarised
    D. the muscle relaxes
    E. the tension is a consequence of tension of elastic fibres
    C. its membrane is depolarised
    (this multiple choice question has been scrambled)
  2. The isometric and isotonic contraction have these things in common:
    A. in both the actin and myosin filaments slide into each other
    B. the muscle contracts by the same amount in both
    C. in both the muscle gets shorter
    D. both exert the same work
    A. in both the actin and myosin filaments slide into each other
    (this multiple choice question has been scrambled)
  3. When we lift a load, it is obvious that the heavier it is, the greater force must be exerted. The property of a muscle to increase force with load weight is give by:
    A. the ability of muscles to contract with greater speed for heavier loads
    B. greater efficacy of using muscle ATP
    C. activation of greater number of muscle fibres
    D. reflexive activation of motoneurones
    E. spontaneous extension of duration of muscle action potential
    C. activation of greater number of muscle fibres
    (this multiple choice question has been scrambled)
  4. The activation of smooth muscle contraction is caused by:
    A. activation of tropomyosin by calmodulin
    B. activation of myosin light-chain kinase by depolarisation
    C. activation of myosin kinase by calmodulin
    D. phosphatase activity of the actin
    E. activation of tropomyosin by Ca++
    C. activation of myosin kinase by calmodulin
    (this multiple choice question has been scrambled)
  5. Calcium from the sarcoplasmic reticulum is transported towards the sarcomere by:
    A. Ca ATP-ase of myosin
    B. diffusion down the concentration gradient that is created by Ca++ binding to actin
    C. active transport via the open dihydropyridine channels
    D. Ca ATP-ase of the sarcoplasmic reticulum (SERCA)
    E. diffusion after opening of the ryanodin channels
    E. diffusion after opening of the ryanodin channels
    (this multiple choice question has been scrambled)
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302259
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Muscle system
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Muscle system
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