Muscle system

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  1. When a smooth muscle is extended (within physiological limits),
    a. its membrane is depolarised
    b. no action potential is generated
    c. the tension is a consequence of tension of elastic fibres
    d. the muscle relaxesno option is correct
  2. The isometric and isotonic contraction have these things in common:
    a. both exert the same work
    b. the muscle contracts by the same amount in both
    c. in both the actin and myosin filaments slide into each other
    d. in both the muscle gets shorter
  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. spontaneous extension of duration of muscle action potential
    c. activation of greater number of muscle fibres
    d. reflexive activation of motoneurones
    e. greater efficacy of using muscle ATP
  4. The activation of smooth muscle contraction is caused by:
    a. activation of tropomyosin by Ca++
    b. activation of myosin light-chain kinase by depolarisation
    c. activation of myosin kinase by calmodulin
    d. activation of tropomyosin by calmodulin
    e. phosphatase activity of the actin
  5. Calcium from the sarcoplasmic reticulum is transported towards the sarcomere by:
    a. Ca ATP-ase of the sarcoplasmic reticulum (SERCA)
    b. diffusion after opening of the ryanodin channels
    c. active transport via the open dihydropyridine channels
    d. Ca ATP-ase of myosin
    e. diffusion down the concentration gradient that is created by Ca++ binding to actin

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Muscle system
2015-04-29 12:52:15
physiology lf2

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