plzz ans wit explanation

Discussion in 'NBDE Exams & Licensure Exams' started by passiondentistr, Jun 5, 2008.

  1. passiondentistr

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    Destruction of left spino crebellar tract at T2 wud be expected to eliminate positional sense on the ?

    1.right side of the body above T2
    2.right side below T2
    3.left side above T2
    4.left side below T2

    Primary role of calcium in activation of cardiac muscle?
    1. couple myosin n actin to form actinomyosin
    2. cause depolarisation of the cell
    3. activate myosin molecule so tat they interact wit actin filaments
     
    #1 passiondentistr, Jun 5, 2008
    Last edited: Jun 5, 2008
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  3. dreamdental

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    Primary role of calcium in activation of cardiac muscle?
    1. couple myosin n actin to form actinomyosin

    ca binds with troponin C there by moving tropomyosin from actin binding sites of myosin resulting in actinomyosin complex.
     
  4. impaction

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    in cardiac muscle there is no troponin c.
    calcium doesnt bind to it but it helps in formation of ca calmodulin as in smooth muscle
     
  5. dreamdental

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    sorry i overlooked "cardiac"
     
  6. doctormeens

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    Answer 1
     
  7. shuntyman

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    only smooth muscle has calmodulin...... skeletal m nd cardiac m has troponin
     
  8. passiondentistr

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    any how the ans to tat q is choice 1 rite?
     
  9. passiondentistr

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    1] P wave occuring in between S_T segment, ectopic beat occuring now will be in
    a. Atria
    b. lower border of bundle of his
     
  10. shuntyman

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    1] P wave occuring in between S_T segment, ectopic beat occuring now will be in
    a. Atria
    b. lower border of bundle of his
     
  11. impaction

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    P wave is produced by atrial depolarization
    and
    ST segment is the segment which represents in the diminishing of ventricular depolarization and the initial phase of ventricular repolarization.
    now Pwave in ST segment means, atrial depolarization when ventricular depolarization is diminshing and ventricular repolariztion is starting.

    this DOES not means that atria is producing another wave.
    BUt here both auricle and ventricle are undergoing contraction independent of each other.
    so when there is atrial contraction suggested by P wave , the ventricular depolarization is by the bundle of HIS,
    as bundle of HIS is slower then AV node, so it lags a bit
    thats why they asked about the presence of P wave in ST segment instead of P wave in QRS.

    :thumbup: i hope it makes sense to you
     

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