Muscle system

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Author:
Marine
ID:
302259
Filename:
Muscle system
Updated:
2015-06-11 23:54:06
Tags:
physiology physio
Folders:
Physio
Description:
Muscle system
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  1. When a smooth muscle is extended (within physiological limits),
    A. no option is correct
    B. the tension is a consequence of tension of elastic fibres
    C. the muscle relaxes
    D. no action potential is generated
    E. its membrane is depolarised
    E. its membrane is depolarised
    (this multiple choice question has been scrambled)
  2. The isometric and isotonic contraction have these things in common:
    A. both exert the same work
    B. in both the muscle gets shorter
    C. the muscle contracts by the same amount in both
    D. in both the actin and myosin filaments slide into each other
    D. 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. reflexive activation of motoneurones
    B. greater efficacy of using muscle ATP
    C. the ability of muscles to contract with greater speed for heavier loads
    D. spontaneous extension of duration of muscle action potential
    E. activation of greater number of muscle fibres
    E. 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 Ca++
    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 calmodulin
    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. diffusion after opening of the ryanodin channels
    B. Ca ATP-ase of myosin
    C. Ca ATP-ase of the sarcoplasmic reticulum (SERCA)
    D. diffusion down the concentration gradient that is created by Ca++ binding to actin
    E. active transport via the open dihydropyridine channels
    A. diffusion after opening of the ryanodin channels
    (this multiple choice question has been scrambled)

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