biochem/physio

Discussion in 'NBDE Exams & Licensure Exams' started by era, May 28, 2008.

  1. era

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    :confused:A patient bites down rapidly on an unexpected hard surface while chewing .cessation of motor unit recruitment i jaw closing muscles is caused by stimulation of
    a muscle spindles
    b mucosal mechanoreceptors
    c periodontal mechanoreceptors
    d nociceptors in dental pulp
    ans c.


    :confused:which of the following explains why an increasing filling of the ventricle during diastole causes a more forceful heart beat?the incressed ventricular volume.
    A.diminishes the refractory period of the ventricle.
    B.incresses end-diastolic fiber length.
    C.facilitates conduction in the heart.
    D.produces a less than optimal load.
    ans B.
     
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  3. IndianGraduate

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    are u putting these questions up cuz ur confused or for the sake of informing others?
     
  4. dreamdental

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    I think he needs some explanation for the answers.
     
  5. era

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    hey guy..answers are according to the answer key..i need some explanation ..:confused:
     
  6. monicabr

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    1) C _ It is proprioceptive function of periodontal ligament.
    2) B _ It is the Frank-Staling relationship. The greater the heart is filled during diastole, the greater will be the force of contraction of the cardiac muscle
     
  7. porcelain258

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    in the second q. i think the reason is greater filling of the ventricle during diastole increases the preload on the heart which causes more forceful contraction
     
  8. porcelain258

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    and the increased preload is ofcourse indicative of increased end diastolic fibre length
     
  9. dreamdental

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    according to frank sterlings law increase lenght increased force.:thumbup:
     

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